Deleting Component Assignments to Operations/Phases 
Prerequisites
If you have just edited the material data that belong to a different production version than the material component, you must access the recipe group again. For technical reasons, you can only display or edit data for one production version in a transaction call.
Procedure
To do so, select the operation or phase on the operation overview (Operations tab page) and choose
.
.The system deletes the assignment. You can now assign the material component to a new operation or phase.