Solution : https://service.sap.com/sap/support/notes/813198 (SAP Service marketplace login required)
Key words :
sd object class select, start transaction su21, press 'change' press, 'permitted activities' button, decipher payment card, authorization object, payment cards, credit card, v_vbak_aat object, c4 activity
Related Notes :
| 766703 | FAQ: Credit card encryption in R/3 systems |
| 633462 | Encrypting credit card data |