Order &1 has cost estimate - no longer possible to adopt plan values

What causes this issue?

An EasyCostPlanning cost estimate was already entered for order &v1&.
It is no longer possible for this order to adopt plan values.

System Response

Action is terminated.

How to fix this error?

Check if the cost estimate on the order should be kept. If not, delete
it. After that it is again possible for the order to adopt plan values
from the appropriation request.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.