Deleting Component Assignments 
Prerequisites
If you have already edited material components in a routing that belong to a different BOM as the material components you want to delete, you must call up the group again.
For technical reasons you can only edit data for one BOM each time you call up the transaction.
Procedure
– The material component overview for the routing
To do so, choose Goto
® Comp. assig. -gen. in the operation overview.– The material component overview for the operation
In the operation overview select the operation and choose Goto ® Comp. assig -op.
Result
The system deletes the component assignment. You can reassign the material components.