https://userapps.support.sap.com/sap/support/knowledge/en/3584842
3584842 - Displaying the Due Date (AUSFD) field in BNK_MONI at header level | SAP Knowledge Base...
The due date (AUSFD) in BNK_MONI and BNK_APP is stored at a line item level for each payment and is not accessible at the header level.