Partner ISB-FIX is not defined. System terminates transfer

What causes this issue?

For transferring loans, it is necessary to maintain the partner
'ISB-FIX'.

System Response

The transfer will be terminated. No records will be processed.

How to fix this error?

Read the documentation on external data transfers for loans. Be sure to
create the entries using ALLCAPS.

Error message extract from SAP system. Copyright SAP SE.