You can open the ScriptReport file (in Script folder) which is a text file and look for something like this:
Line 20589: ------------------------------
Line 20591: SelectFaction, selected: Austria
Line 20592: Started processing event: evt_nam_FRA_LightInf_Replacement_Reduction
Line 20592: This event is not yet referenced, base number of allowed occurences 999
Line 20595: EvalReplacement: Austria RPL: FRA Light Infantry Current Number 6 against 6 - Operator: >= Result: True
Line 20597: Entering triggered actions for event evt_nam_FRA_LightInf_Replacement_Reduction
Line 20598: Change Remplacements Austria FactionTag: FRA Rpl type: 32 changed by: -1
Line 20599: ChangeConscriptPool Austria New Conscripts pool is 34
Line 20601: Finished processing event: evt_nam_FRA_LightInf_Replacement_Reduction
Line 20601: ------------------------------
This is typically one of the replacement(s) into conscript(s) conversion event...you should fine some of them
