Product conf. not possible at action points with retroactive execution

What causes this issue?

You have either entered the action <LS>production backflush</> for an
optional action point that can be carried out retroactively or changed
the type of the action point at which the action <LS>production
backflush</> is carried out to <LS>optional with retroactive execution
</>.

System Response

The system changes the action point type to <LS>optional</>.

How to fix this error?

If you want the action point to be <LS>obligatory</>, you can simply can
change the default value <LS>(optional).</>
If you want the action point type to be <LS>optional with retroactive
execution</>, you first have to deassign it from the <LS>production
backflush</>.

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.