Transfer postings exist for selected grouping WBS elements

What causes this issue?

Transfer postings exist for the selected grouing WBS element.

System Response

The replenishment element cannot be fully assigtned.

How to fix this error?

Execute the pegged requirements display for <ZH>all</> the grouping WBS
elements affected by the transfer postings.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.