Hi Robert,
Are you using Bank Account Management in SAP Cash Management powered by SAP HANA? Could you please let me know which version you are using?
This product is delivered with SAP Simple Finance product. Starting from SAP Simple Finance, on-premise edition 1503 (formally known as sFIN 2.0 SP00) the table T012K is no longer supported. House bank accounts are migrated to Bank Account Management and you should be able to find the account you created in table FCLM_BAM_ACLINK2 instead.