What causes this issue?

The implementation of the IHC_BADI_TRANS_CM BAdI returned an error.

System Response

If you use the standard implementation, your data was not sent to
<LS>SAP Cash Management</>.
If you are using a customer-defined implementation, contact your systems
administrator.

How to fix this error?

If you use the standard implementation, complete your <LS>SAP Cash
Management </>Customizing settings.
If you are using a customer-defined implementation, contact your systems
administrator.

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.