message: Set the FromBackgroundEvent flag
diff: @@ -1656,6 +1656,11 @@ void AliAnalysisTaskAO2Dconverter::FillEventInTF()
  if (aodmcpt && aodmcpt->IsPhysicalPrimary()) // AOD
  mcparticle.fFlags |= MCParticleFlags::PhysicalPrimary;
  + if (MCEvt && MCEvt->IsFromBGEvent(i)) // ESD
  + mcparticle.fFlags |= MCParticleFlags::FromBackgroundEvent;
  + if (aodmcpt && aodmcpt->IsFromSubsidiaryEvent()) // AOD: PH Not sure if corresponds to BKG event
  + mcparticle.fFlags |= MCParticleFlags::FromBackgroundEvent;
  +
  mcparticle.fIndexArray_Mothers_size = 1;
  mcparticle.fIndexArray_Mothers[0] = particle ? particle->GetMother(0) : aodmcpt->GetMother();
  if (mcparticle.fIndexArray_Mothers[0] > -1)
  