I am facing a problem in RGP. When i am sending a packing material to a vendor,i differentiate it with 3 classes A,B & C and this A,B,C is maintained in batch level of the same material, the material code is one but it has three batches. When i am sending A class material the vendor might send the B class or C class. How can i work in this situation? I don't have any optimal solution for this senerio.