Document splitting information in (clearing) document is not consistent

What causes this issue?

The invoice reference as a document splitting characteristic is not
complete in the clearing document.

System Response

The clearing document is not updated in Funds Management, meaning that
the corresponding invoice is not converted to payment.

How to fix this error?

Check whether you have selected the correct document type for the
business transaction to be posted. The Customizing settings for your FI
document splitting may be incorrect.
If you are happy with your configuration even though some payments may
not be converted in Funds Management, you can deactivate the message
(customizable message).

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.