Alternate part functionalities for purchasing and planning

Hi @BLGBE 

I am sorry your requirement here is not fully clear to me. Do you want to create a purchase  alternative part (B) for master part (A)?

Best Regards,
Tharaka,

Hi @BLGBE 

Can you check if supplier for purchase part records available for purchase alternative parts as well. It has to be as same as the purchase master part (supplier, site)

Best Regards,
Tharaka.

The option to Plan Alternate Component in MRP pertains only to the situation where primary part A has demand originating from a parent part(s), i.e., when A is seen as a component. If B is set as an Alternate Component of A and B is set to Include During MRP, on-hand inventory of B will be considered as supply before generating any supply required of A.

When a customer order line is entered for part A, MRP will see the demand from the CO Line and plan supply of A accordingly. MRP will not examine the availability of any alternate parts. You might want to setup Alternate Sales Part Base Data, where B can be defined as an alternate sales part for A. With this setup, and running Availability Check, if there is not enough A to satisfy the required quantity on the required date, you have the option to substitute part B for A partially or completely on the customer order. 

When an alternate purchase part has been setup, this simply allows you to add/change a purchase order line from the primary part A to any of its alternates defined in the Alternate Purchase Part Base Data page. This is for those situations when the Supplier cannot meet the quantity and/or date requirement for the primary part A. This requires the same supplier to be setup as a supplier for both parts A and B.

So in the original situation above, only if A were a purchased component at some level in the structure of the sales part on the customer order would MRP do what you expect and plan to use the (8) on-hand of B plan a purchase requisition for (2) of part A.