SAP Function Module search on FI_BN
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FI_BNK_ADJUST_HEADER_FILE - Extra header for file
FI_BNK_COLLECT_PAYLOAD - Collects payloads as a (x)-string for payment medium file
FI_BNK_SET_HMAC_KEY - Set HMAC key
FI_BNK_SIGN_IF_DMEE_ACTIVE - Calculate signature when DMEE active
FI_BNK_SIGN_NO_DMEE - Calculate signature when DMEE not active
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