Solution : https://service.sap.com/sap/support/notes/966863 (SAP Service marketplace login required)
Key words :
menu item utilities -> generate table maintenance dialog, field data element vkpbz vkpbz_kk activate, contract -> fi-ca integration -> define type, -account holder enhance table tivxabdcnacct add, enhance domain rexauseexistcnacct add, contract type/bp role, source code corrections implement, maintenance dialog add, field type/sec, edit table/view