No valid mandate could be determined for partner &1

What causes this issue?

There are mandates for business partner &V1&. However, none of the
mandates are valid for the specified criteria.

System Response

The system issues a warning message.

How to fix this error?

If the error occurs in a dialog transaction and the mandate reference is
available as an input field, use the input help (F4) to display the
checked mandates and change them as necessary or create a new mandate.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.