Solution : https://service.sap.com/sap/support/notes/326382 (SAP Service marketplace login required)
Key words :
additional key words payment cards, attached source code correction, payment card master data, default payment card, function module sd_ccard_vckun_maintain, function group v20a, prerequisites kna1-kunnr, -key fields, kna1-kunnr, vckun-ccdef
Related Notes :
514296 | Composite SAP note payment cards (4.0/4.5/4.6) |