diff --git a/PWGEM/Dilepton/Core/DileptonMC.h b/PWGEM/Dilepton/Core/DileptonMC.h
index 83a56821628..6194716c508 100644
--- a/PWGEM/Dilepton/Core/DileptonMC.h
+++ b/PWGEM/Dilepton/Core/DileptonMC.h
@@ -2222,6 +2222,9 @@ struct DileptonMC {
         if (cfgEventGeneratorType >= 0 && mccollision_from_neg.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcpos.emmceventId() != collision.emmceventId() || mcneg.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
 
         if (isPairOK(pos, neg, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(pos.globalIndex(), neg.globalIndex()));
@@ -2238,6 +2241,9 @@ struct DileptonMC {
         if (cfgEventGeneratorType >= 0 && mccollision_from_pos2.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcpos1.emmceventId() != collision.emmceventId() || mcpos2.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
 
         if (isPairOK(pos1, pos2, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(pos1.globalIndex(), pos2.globalIndex()));
@@ -2254,6 +2260,9 @@ struct DileptonMC {
         if (cfgEventGeneratorType >= 0 && mccollision_from_neg2.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcneg1.emmceventId() != collision.emmceventId() || mcneg2.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
         if (isPairOK(neg1, neg2, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(neg1.globalIndex(), neg2.globalIndex()));
         }
diff --git a/PWGEM/Dilepton/Core/SingleTrackQCMC.h b/PWGEM/Dilepton/Core/SingleTrackQCMC.h
index bde658f6c28..97191e4fe98 100644
--- a/PWGEM/Dilepton/Core/SingleTrackQCMC.h
+++ b/PWGEM/Dilepton/Core/SingleTrackQCMC.h
@@ -1055,6 +1055,9 @@ struct SingleTrackQCMC {
           if (cfgEventGeneratorType >= 0 && mccollision_from_track.getSubGeneratorId() != cfgEventGeneratorType) {
             continue;
           }
+          if (cfgRequireTrueAssociation && (mctrack.emmceventId() != collision.emmceventId())) {
+            continue;
+          }
 
           if (dielectroncuts.cfg_pid_scheme == static_cast<int>(DielectronCut::PIDSchemes::kPIDML)) {
             if (!cut.template IsSelectedTrack<false>(track)) {
@@ -1074,6 +1077,9 @@ struct SingleTrackQCMC {
           if (cfgEventGeneratorType >= 0 && mccollision_from_track.getSubGeneratorId() != cfgEventGeneratorType) {
             continue;
           }
+          if (cfgRequireTrueAssociation && (mctrack.emmceventId() != collision.emmceventId())) {
+            continue;
+          }
           if (!cut.template IsSelectedTrack<false>(track)) {
             continue;
           }
diff --git a/PWGEM/Dilepton/Tasks/checkMCPairTemplate.cxx b/PWGEM/Dilepton/Tasks/checkMCPairTemplate.cxx
index 91ec19cdacd..b6e0118bd15 100644
--- a/PWGEM/Dilepton/Tasks/checkMCPairTemplate.cxx
+++ b/PWGEM/Dilepton/Tasks/checkMCPairTemplate.cxx
@@ -2804,6 +2804,9 @@ struct checkMCPairTemplate {
         if (cfgEventGeneratorType >= 0 && mccollision_from_neg.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcpos.emmceventId() != collision.emmceventId() || mcneg.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
 
         if (isPairOK(pos, neg, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(pos.globalIndex(), neg.globalIndex()));
@@ -2820,6 +2823,9 @@ struct checkMCPairTemplate {
         if (cfgEventGeneratorType >= 0 && mccollision_from_pos2.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcpos1.emmceventId() != collision.emmceventId() || mcpos2.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
 
         if (isPairOK(pos1, pos2, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(pos1.globalIndex(), pos2.globalIndex()));
@@ -2836,6 +2842,9 @@ struct checkMCPairTemplate {
         if (cfgEventGeneratorType >= 0 && mccollision_from_neg2.getSubGeneratorId() != cfgEventGeneratorType) {
           continue;
         }
+        if (cfgRequireTrueAssociation && (mcneg1.emmceventId() != collision.emmceventId() || mcneg2.emmceventId() != collision.emmceventId())) {
+          continue;
+        }
         if (isPairOK(neg1, neg2, cut, tracks)) {
           passed_pairIds.emplace_back(std::make_pair(neg1.globalIndex(), neg2.globalIndex()));
         }