You cannot create the delta opening balance for version &/&/&

What causes this issue?

An opening balance of the line items cannot be written for plan version
&V1& &V2& &V3&.
Possible reasons:
An opening balance has already been created.
The line-item update is not yet active.
The integration indicator is already activated.

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?

Use the function 'Activate line items and integration'.
<DS:TRAN.KP96>Execute function</>

Error message extract from SAP system. Copyright SAP SE.