Unable to change every document

What causes this issue?

Some documents could not be changed during the mass change procedure.
The cause is probably documents from a document type where certain
fields that you want to change are not changeable.

System Response

The items from the documents not changed are marked in red.

How to fix this error?

You can display a change error log for each of these items (function in
application toolbar). In the individual document change procedure you
can check which fields are changeable and change the documents
individually if necessary.

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.