Storage Location required entry in Material Master

Hi

My client requirement is, at the time of creation of Material Master, System will ask for Storage Location.Without Storage Location, Icann't create Material Master.

Even if I'll select Plant and Storage LOcation View & Warehouse View, System is not asking the storage Location.

Can anybody suggest me where I'll set the setting so that system will ask for Storage Location mandatory in Material Master.

Thanks & regards

PKB