& is a delta version. All objects are not taken into consideration.

What causes this issue?

You want to activate the plan integration for version &V1&. The
version &V1& is created in controlling area &V2& as a
<DS:GLOS.delta_version>delta version</>.

System Response

If planning data for cost objects is in the version &V1&, the data is
not taken into consideration for the plan integration. Plan line items
are not generated for these objects.

How to fix this error?

Plan cost objects in only one version that was indicated as plan
integrated when it was created.

Error message extract from SAP system. Copyright SAP SE.