Check to see if you have plugin "Change Management - State Model" installed. If so look in the script include "ChangeRequestSNC". It should have the following line near the top...

ChangeRequestSNC.ENFORCE_DATA_REQ_PROP = "com.snc.change_management.enforce_data_requirements";

Look in script inc ChangeRequestStateHandlerSNC and ChangeManagementEventHandlerSNC for ENFORCE_DATA_REQ_PROP