Error regenerating in tcode GRNWB

When running tcode GRNWB, with selection RRREA:Realignment, for BUS_TRANS_MSG getting error "Function module /1CRMGC/CGBUS_TRANS_MSG_RCF does not exist". For some reason in our production system, that function is not regenerating like it does in our test systems. Does anyone have a clue as to what might cause that? It should get deleted and then recreated, but in our prod system it is not.