Costing variant & does not allow price update

What causes this issue?

Costing variant &V1& does not allow the prices in the selection to be
updated.

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?

Choose a costing variant that allows the required prices to be
updated.

Error message extract from SAP system. Copyright SAP SE.