Clearing cannot be reversed (contract number)

Message type: E = Error

Message class: F5 - Document Editing

Message number: 538

Message text: Clearing cannot be reversed (contract number)



What causes this issue?

It is not possible to terminate clearing because a contract
number was posted in the line item &V4& of the document &V1& &V2&
&V3&.

Error message extract from SAP system. Copyright SAP SE.