Assignment object/account are currently blocked by &

What causes this issue?

User &V1& is processing a data record which determines with which unit
of measure your data is written in CO.

System Response

If this change is not posted or terminated, you cannot make your
posting because faulty data might be written in CO.

How to fix this error?

Contact user &V1&. The affected data record is &V2& and can be found in
the CCKA file.

Error message extract from SAP system. Copyright SAP SE.