CO version 0 is not allowed

What causes this issue?

You want to use the CO version 0 for valuated project stock. However,
this is the CO version for unvaluated stock.

System Response

The operation cannot be executed.

How to fix this error?

Choose a CO version not equal to 0.

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.