I've created a substitution in TCode GGB1 in Application Area Joint Venture Accounting at the line item level for a specific Document Type (JVAP-DOCTY = 'SA') AND GL Account (JVAP-RACCT = '80017030') and substitute a cost center (JVAP-RCNTR = '72000367'). I run the Substitution/Validation regeneration program (RGUGBR00) and activate full trace. The existing FI substitution rules are called but the JVA substitution is never initiated. Is there another step required to activate Substitutions/Validations in the Joint Venture Accounting application area? Any assistance is greatly appreciated.