3693483 - Error "BCM return code (sy-subrc): 5 / Exception name: proxy_error" in the Manage Bank Messages app - SAP S/4HANA Cloud Public Edition

A PAIN.002 payment status message fails to update the payment status, leading to an error like "BCM return code (sy-subrc): 5 / Exception name: proxy_error" in the Manage Bank Messages app. 

SAP S/4HANA Cloud Public Edition

1. Send a payment file to the bank.
2. Receive a PAIN.002.001.03 acknowledgment message with status PDNG (Pending by bank).
3. Receive another PAIN.002.001.03 acknowledgment message with status ACCP (Accepted).
4. Observe that the file is in error status in the manage bank messages app with the error message: BCM return code (sy-subrc): 5 / Exception name: proxy_error.

This is standard system behavior. The Bank Communication Management (BCM) logic prevents the payment status from being downgraded (e.g., from Pending by Bank to Received by Bank). 

1. Verify the external status mappings in SSCUI 104313 - Map External Status to Internal Status.
2. Ensure the sequence of acknowledgment messages from the bank aligns with the standard configuration.

PAIN.002.001.03, manage bank messages app, BCM return code, sy-subrc: 5, exception name: proxy_error, PDNG, ACCP, pending by bank, accepted status, payment file, acknowledgment message, SSC-UI 104313, external status mapping, SAP S/4HANA Cloud Public Edition, direct bank communication. , KBA , FIN-FSCM-BNK-2CL , Direct Bank Communication (Public Cloud) , Known Error