Hello,
The banking related information is stored in the table BNKA. However for it i think this should be synchronized with the table of similar name from the ECC system similar to the way the material is replicated via R3AC3 using the object DNL_CUST_BNKA.
The link between the BNKA table is with the BUT0BK table in SRM.
Thanks & Regards
Pramod Mallya