Update group header: &

What causes this issue?

Evaluation of the current Customizing settings gives update
group &V1& for the document header.
At the time of updating the update group &V2& was determined and
stored in the document. When a document is changed &V2& is updated,
according to the update group that is stored in the document.

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

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.