3470981 - No attribute with qualifier found issue when replicating B2BUnit from ECC to Commerce

When sending ADRMAS/ADR3MAS/DEBMAS from SAP ECC to SCPI and further the resulting B2BUnit to the SAP Commerce System, the SAP Commerce Cloud response with an error 500:

"An error occurred while attempting to save entries for entityType: B2BUnit, with error message No attribute with qualifier active found."

If removing the content for the field from the payload, the next standard field is reported with the similar error 500:

"An error occurred while attempting to save entries for entityType: B2BUnit, with error message No attribute with qualifier buyer found.

SAP Commerce Cloud

B2BUnit, InboundB2BUnit , KBA , CEC-SCC-INT-BTPI , BTP Extensions Integration , Problem