Solution : https://service.sap.com/sap/support/notes/984407 (SAP Service marketplace login required)
Key words :
refx_v_tivcaimpl_v switch bc set, rexa_payment_fc_s-incbankdetailidv_tfk042z-xbkkt reason, 'required master record specifications', attached source code corrections, attached source code, terms rexa_payment_fc_s-incpymtmeth, required entry field, start transaction sm30, real estate contract, bank details id