Alternate Item in BOM

Question

We are manufacturing a assembly using alternate raw materials say RM1 or RM2 or RM3.
We want to define these three raw materials alternately in such a way that;
1.     If stock of RM1, RM2 & RM3 is available, then system should consume the RM1 first always.
2.     If required qty is 100. Stock of RM1 is 40, RM2 is 30 and RM3 is 100. In such condition, system should consume                the 40 qty of RM1, 30 qty of RM2 and 30 qty of RM3.
3.     If stock of RM1 is zero, then system should consume the stock of RM2.
4.     If stock of RM1 and RM2 is zero, then system should consume the stock of RM3.
Please guide how to create a BOM to fulfill above requirements.

Answer 1

Dear Sachin,
In my understanding the system allows to maintain the priority,strategy and usage probability for the items grouped under
alternative item group.
Priority:This determines the priority for planned withdrawal of items.
Example:
Two items are assigned to an alternative item group (A1) with the following values for priority:
Item 0060 Value for priority: 02
Item 0065 Value for priority: 01
The system reads item 0065 first.
*Usage probability*MRP plans these alternative material components according to probability of use.
In this field you enter a percentage to show the probability of using an object in production. Material requirements for the BOM
components are planned according to the usage probability.
The system does consumes the items as per the stock availability automatically.
So in your case even stock determination will not work,as this decides only in what sequence the stock should be consumed for
a material(from which storage location to which storage location).
Check and revert.
Regards
Mangalraj.S