Restrict Users from creating serials through GRN.

Employees often get confused by the option to create serials for a non-serialized inventory item while creating GRN against a purchase order. It is easy to mistake it as a mandatory step to create the purchase order. We have to go back and manually convert the valuation method to non serialized, which is inconvenient. This is a formal request to add a trigger in Module Configuration > GRN > Allow to create serials for non-serialized inventory.