[SIGMON-243] AN_RB_FPA fix

task: https://its.cern.ch/jira/browse/SIGMON-243

I tested on SWAN:
AN_RB_FPA for RB.A23 2021-11-10 14:08:26.86+01:00
AN_RQ_FPA for RQ.A23 2021-11-10 14:08:26.84+01:00