Hi Sudipta,
As per standard SAP we can maintain the back flush in 4 places i.e.
1. material master : always back flush whenever you try to do the goods movement against this material system will always do the automatic goods issue
2.Work centre: Against the work centre if you want to consume the components system will do the same
3.Routing : SAP allows to enter the components against each operation in the routing hence for making that operation what ever child components are required for making the automatic GI (Back flush) for that operation in that situation we will use the routing back flush
4. Production order : if you want to make the components one time back flush in that situation we will activate the back flush in production order -> component overview
Similarly
Auto Goods receipt
Production scheduling profile : if you want for that material every GR should happen automatically in that situation we will activate the auto GR option in the production scheduling profile
Control key : if you want to make operation level goods receipt in that situation we will activate the auto GR in the control key
conclusion : if you activate the back flush in the material master no need to activate any where. it flow automatically
if you maintain the auto GR in production scheduling profile then no need to maintain in control key
Regards,
Venkatesh