Document &1 is from Funds Management, you cannot change the document

What causes this issue?

This document was transferred with the vendor document interface
(program RFFMSDCA) from the component <ZK>Funds Management (PSM-FM)</>
to the component <LS>Public Sector Contract Accounting (PSCD)</>.

System Response

The document cannot be changed in the component <LS>Public Sector
Contract Accounting</> because this would cause inconsistencies in the
original document in <LS>Funds Management</>.

How to fix this error?

To change the document, you have to post it again in the component
<LS>Funds Management (PSM-FM)</>. Then reverse the old document using an
inverse posting.

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.