Opening balance updated for version &/&/& -> Long text

What causes this issue?

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

System Response

For the above plan version, an opening balance has been written for
the totals records that do not yet exist as line items.

How to fix this error?

You can activate the planned data integration using the function
'Activate LIs and integration'
<DS:TRAN.KP96>Execute function</>

Error message extract from SAP system. Copyright SAP SE.