This IDoc cannot be changed

What causes this issue?

This IDoc cannot be modified.
The IDoc is either an original IDoc (copy of an IDoc before editing
took place) or an IDoc which was posted successfully in the
application.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You can only display or print this IDoc.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.