SAP Message AP269 - &1 &2 is already being processed

Diagnosis
You want to change the assignment of an appropriation request to aninvestment program position.
However, the appropriation request is assigned to measure '&V1& &V2&',which is currently being processed by user &V3&, who could have justchanged the assignment of the measure to an investment programposition.

System Response
Since the assignment of an investment program position is allowed to beentered either from the appropriaton request or from themeasures assigned to the appropriation request, processing from both atthe same time is not allowed.

Procedure
Decide what to do after discussing the situation with user &V3&.