diff --git a/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.cxx b/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.cxx
index ca22de7b5cf74b0e2481fbb56ee58fcf71aab641..139a5a3154fad2cfe30bafc130fea90977195ccd 100644
--- a/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.cxx
+++ b/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.cxx
@@ -39,6 +39,9 @@ StatusCode DoubleEventSelectorAthenaPool::initialize()
   ATH_CHECK(EventSelectorAthenaPool::initialize());
 
   ATH_CHECK(m_secondarySelector.retrieve());
+  if (dynamic_cast<EventSelectorAthenaPool *>(&*(m_secondarySelector)) == nullptr) {
+    m_secondaryByteStream = true;
+  }
 
   return StatusCode::SUCCESS;
 }
@@ -175,12 +178,22 @@ StatusCode DoubleEventSelectorAthenaPool::recordAttributeList() const
   ATH_MSG_DEBUG("AttributeList size " << attrList.size());
   auto athAttrList = std::make_unique<AthenaAttributeList>(attrList);
 
-  // Fill the new attribute list from the primary file
-  ATH_CHECK(fillAttributeList(athAttrList.get(), "", false));
-
-  // Fill the new attribute list from the secondary file
-  ATH_MSG_DEBUG("Append secondary attribute list properties to the primary one with a suffix: " << m_secondaryAttrListSuffix.value());
-  ATH_CHECK(m_secondarySelector->fillAttributeList(athAttrList.get(), "_" + m_secondaryAttrListSuffix.value(), true));
+  // Decide what to do based on the type of secondary file
+  if (m_secondaryByteStream) {
+    // Always add ByteStream as primary input
+    ATH_CHECK(m_secondarySelector->fillAttributeList(athAttrList.get(), "", false));
+
+    // Then fill the new attribute list from the primary file
+    ATH_MSG_DEBUG("Append primary attribute list properties to the secondary one with a suffix: " << m_secondaryAttrListSuffix.value());
+    ATH_CHECK(fillAttributeList(athAttrList.get(), "_" + m_secondaryAttrListSuffix.value(), true));
+  } else {
+    // Fill the new attribute list from the primary file
+    ATH_CHECK(fillAttributeList(athAttrList.get(), "", false));
+
+    // Fill the new attribute list from the secondary file
+    ATH_MSG_DEBUG("Append secondary attribute list properties to the primary one with a suffix: " << m_secondaryAttrListSuffix.value());
+    ATH_CHECK(m_secondarySelector->fillAttributeList(athAttrList.get(), "_" + m_secondaryAttrListSuffix.value(), true));
+  }
 
   // Add info about secondary input
   athAttrList->extend("hasSecondaryInput", "bool");
@@ -235,6 +248,11 @@ void DoubleEventSelectorAthenaPool::handle(const Incident& inc)
       msg(MSG::DEBUG) << "SourceID: " << source.first << " active events: " << source.second << endmsg;
   }
 
+  // Nothing to do if secondary event selector is ByteStream
+  if (m_secondaryByteStream) {
+    return;
+  }
+
   // Secondary guid
   SG::SourceID fid2;
   SG::DataProxy* dp2 = sg->proxy(ClassID_traits<DataHeader>::ID(), "SecondaryEventSelector", true);
diff --git a/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.h b/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.h
index 0c379ae3ecfe73cae0641374b944246247cf6180..2213ce0b629deca614e0fa442ef923c40fadc0af 100644
--- a/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.h
+++ b/Database/AthenaPOOL/EventSelectorAthenaPool/src/DoubleEventSelectorAthenaPool.h
@@ -64,6 +64,9 @@ private:
   ServiceHandle<ISecondaryEventSelector> m_secondarySelector{this, "SecondaryEventSelector", "SecondaryEventSelector", ""};
 
   Gaudi::Property<std::string> m_secondaryAttrListSuffix{this, "SecondaryAttrListSuffix", "secondary", ""};
+
+  // Cache if secondary selector is ByteStream
+  bool m_secondaryByteStream{};
 };
 
 #endif
diff --git a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
index 10f3d60b410b8472d3c5cea1efa84ae2ab303644..29be28acd0d43c82442ad5ecbf0d141b6d70d132 100644
--- a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
+++ b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
@@ -1000,9 +1000,14 @@ StatusCode EventSelectorAthenaPool::fillAttributeList(coral::AttributeList *attr
       (*attrList)[iter.tokenName() + suffix].data<std::string>() = iter->toString();
       ATH_MSG_DEBUG("record AthenaAttribute, name = " << iter.tokenName() + suffix << " = " << iter->toString() << ".");
    }
-   attrList->extend("eventRef" + suffix, "string");
-   (*attrList)["eventRef" + suffix].data<std::string>() = m_headerIterator->eventRef().toString();
-   ATH_MSG_DEBUG("record AthenaAttribute, name = eventRef" + suffix + " = " <<  m_headerIterator->eventRef().toString() << ".");
+
+   std::string eventRef = "eventRef";
+   if (m_isSecondary.value()) {
+      eventRef.append(suffix);
+   }
+   attrList->extend(eventRef, "string");
+   (*attrList)[eventRef].data<std::string>() = m_headerIterator->eventRef().toString();
+   ATH_MSG_DEBUG("record AthenaAttribute, name = " + eventRef + " = " <<  m_headerIterator->eventRef().toString() << ".");
 
    if (copySource) {
       const coral::AttributeList& sourceAttrList = m_headerIterator->currentRow().attributeList();
diff --git a/Event/ByteStreamCnvSvc/src/EventSelectorByteStream.cxx b/Event/ByteStreamCnvSvc/src/EventSelectorByteStream.cxx
index 34b44397e1c77e85b98fe630048c6f0b53863ace..aeaa3f9091a23369709f02c7da74d9340ba60841 100644
--- a/Event/ByteStreamCnvSvc/src/EventSelectorByteStream.cxx
+++ b/Event/ByteStreamCnvSvc/src/EventSelectorByteStream.cxx
@@ -754,24 +754,24 @@ StatusCode EventSelectorByteStream::recordAttributeList() const
 
 StatusCode EventSelectorByteStream::fillAttributeList(coral::AttributeList *attrList, const std::string &suffix, bool /* copySource */) const
 {
-   attrList->extend("RunNumber"   + suffix, "long");
-   attrList->extend("EventNumber" + suffix, "long");
-   attrList->extend("Lumiblock"   + suffix, "int");
-   attrList->extend("BunchID"     + suffix,  "int");
-   attrList->extend("CrossingTimeSec"  + suffix, "unsigned int");
-   attrList->extend("CrossingTimeNSec" + suffix, "unsigned int");
+   attrList->extend("RunNumber"   + suffix, "unsigned int");
+   attrList->extend("EventNumber" + suffix, "unsigned long long");
+   attrList->extend("LumiBlockN"  + suffix, "unsigned int");
+   attrList->extend("BunchId"     + suffix, "unsigned int");
+   attrList->extend("EventTime"        + suffix, "unsigned int");
+   attrList->extend("EventTimeNanoSec" + suffix, "unsigned int");
 
    // fill attribute list
    const RawEvent* event = m_eventSource->currentEvent();
 
-   (*attrList)["RunNumber" + suffix].data<long>() = event->run_no();
+   (*attrList)["RunNumber" + suffix].data<unsigned int>() = event->run_no();
    if (event->version() < 0x03010000) {
-      (*attrList)["EventNumber" + suffix].data<long>() = event->lvl1_id();
+      (*attrList)["EventNumber" + suffix].data<unsigned long long>() = event->lvl1_id();
    } else {
-      (*attrList)["EventNumber" + suffix].data<long>() = event->global_id();
+      (*attrList)["EventNumber" + suffix].data<unsigned long long>() = event->global_id();
    }
-   (*attrList)["Lumiblock" + suffix].data<int>() = event->lumi_block();
-   (*attrList)["BunchID" + suffix].data<int>() = event->bc_id();
+   (*attrList)["LumiBlockN" + suffix].data<unsigned int>() = event->lumi_block();
+   (*attrList)["BunchId" + suffix].data<unsigned int>() = event->bc_id();
 
    unsigned int bc_time_sec = event->bc_time_seconds();
    unsigned int bc_time_ns  = event->bc_time_nanoseconds();
@@ -781,8 +781,8 @@ StatusCode EventSelectorByteStream::fillAttributeList(coral::AttributeList *attr
       ATH_MSG_WARNING(" bc_time nanosecond number larger than 1e9, it is " << bc_time_ns << ", reset it to 1 sec");
       bc_time_ns = 1000000000;
    }
-   (*attrList)["CrossingTimeSec" + suffix].data<unsigned int>() = bc_time_sec;
-   (*attrList)["CrossingTimeNSec" + suffix].data<unsigned int>() = bc_time_ns;
+   (*attrList)["EventTime" + suffix].data<unsigned int>() = bc_time_sec;
+   (*attrList)["EventTimeNanoSec" + suffix].data<unsigned int>() = bc_time_ns;
 
    const OFFLINE_FRAGMENTS_NAMESPACE::DataType* buffer;
 
diff --git a/Event/ByteStreamTest/share/ByteStreamTestSelectors.ref b/Event/ByteStreamTest/share/ByteStreamTestSelectors.ref
index 25f60c7b2181a3db8631b1b7e35d3bdfbf7f044a..0278de357e60eda4fc79ad620ccf3ac35241f351 100644
--- a/Event/ByteStreamTest/share/ByteStreamTestSelectors.ref
+++ b/Event/ByteStreamTest/share/ByteStreamTestSelectors.ref
@@ -93,12 +93,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186525031
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 339
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 189247220
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186525031
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 339
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 189247220
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060342676
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -188,12 +188,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186524665
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 3284
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 184074160
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186524665
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 3284
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 184074160
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060342310
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -277,12 +277,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186542447
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 153
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 444366780
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186542447
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 153
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 444366780
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060360092
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -366,12 +366,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186543405
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 2757
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 458481815
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186543405
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 2757
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 458481815
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060361050
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -455,12 +455,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186548387
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 1931
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 529867525
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186548387
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 1931
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 529867525
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060366032
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -544,12 +544,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186515186
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 613
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 48308825
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186515186
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 613
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 48308825
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060332831
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 132
@@ -634,12 +634,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186556019
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 3170
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 639275495
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186556019
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 3170
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 639275495
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060373664
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
@@ -723,12 +723,12 @@ Found 1 proxy for ClassID 226113180 (xAOD::AuxInfoBase):
 <<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>> 
 
 EventSelector.E...   INFO Found attribute list
-EventSelector.E...   INFO Spec element RunNumber (long) : 327265
-EventSelector.E...   INFO Spec element EventNumber (long) : 186542866
-EventSelector.E...   INFO Spec element Lumiblock (int) : 100
-EventSelector.E...   INFO Spec element BunchID (int) : 1260
-EventSelector.E...   INFO Spec element CrossingTimeSec (unsigned int) : 1497896168
-EventSelector.E...   INFO Spec element CrossingTimeNSec (unsigned int) : 450530190
+EventSelector.E...   INFO Spec element RunNumber (unsigned int) : 327265
+EventSelector.E...   INFO Spec element EventNumber (unsigned long long) : 186542866
+EventSelector.E...   INFO Spec element LumiBlockN (unsigned int) : 100
+EventSelector.E...   INFO Spec element BunchId (unsigned int) : 1260
+EventSelector.E...   INFO Spec element EventTime (unsigned int) : 1497896168
+EventSelector.E...   INFO Spec element EventTimeNanoSec (unsigned int) : 450530190
 EventSelector.E...   INFO Spec element TriggerStatus (unsigned int) : 0
 EventSelector.E...   INFO Spec element ExtendedL1ID (unsigned int) : 4060360511
 EventSelector.E...   INFO Spec element L1TriggerType (unsigned int) : 129
diff --git a/Event/ByteStreamTest/src/EvenEventsSelectorTool.cxx b/Event/ByteStreamTest/src/EvenEventsSelectorTool.cxx
index 12bb519fd6b3869c92c64f029bdf7fe0fd9761f4..8f7db020b33e65c5fac0d77b847f8503457f068b 100755
--- a/Event/ByteStreamTest/src/EvenEventsSelectorTool.cxx
+++ b/Event/ByteStreamTest/src/EvenEventsSelectorTool.cxx
@@ -38,7 +38,7 @@ StatusCode EvenEventsSelectorTool::postNext() const {
         ++it;
       }
       // take only even events
-      if ((*attrList)["EventNumber"].data<long>()%2==0) {
+      if ((*attrList)["EventNumber"].data<unsigned long long>()%2==0) {
         retc = StatusCode::RECOVERABLE;
         ATH_MSG_INFO("Rejecting event");
       }