How to set BOM when splitting material codes from different suppliers for the same material

[PPL]

May I ask if you have encountered the following business scenarios and how to set the finished product part number and its BOM structure.
The same component is supplied by different suppliers, and different material codes can be established by splitting and splitting according to the supplier. Theoretically, it can be replaced, but the first supplier is preferred.
For example:
Supplier A, material code 1001A, preferred
Supplier B, material code 1001B
Supplier C, material code 1001C
Then, when selling to different regions, each region also needs to designate suppliers for sub components.
For example,
When selling to region 1, supplier A with material code 1001A must be used
When selling to region 2, any one of A, B, or C can be used.
We have already used configuration and variant materials, and Area 1 can be selected through optional configuration.
Region 2, if we choose one by default, the material requirements of the other two cannot be calculated.
How to set the finished product part number and its BOM structure in this situation.

How to calculate material demand for alternative materials.

[DerekDing]

When selling to region 1, supplier A with material code 1001A can be chosen through the Pre-condition (OD).

When selling to region 2, you can create a New material 1001 and maintain it into the BOM, and set OD  pre-condition to choose this new material 1001 when region =2.

Then Create FFF （PIC01）for the Main material 1001， and Set the 1001A  1001B 1001C into this FFF group, when Running MRP, the system will generate 1001 as PR, and the 1001A  1001B 1001C can be interchangeable. 

For more information about MPN, you can check the link as below.

Interchangeable Manufacturer Parts in MRP | SAP Help Portal

[PPL]

Thank you, expert. Do you mean to add another code for materials supplied by the same supplier? For example, Supplier A with material code 1001A, code 1001 in region 1, and use 1001A in region 2. If the same supplier supplies, adding different material codes will also increase management complexity. We have also considered using FFF materials, but can there be a good solution for the following special situations? If we add another area, When selling to region 3, supplier A with material code 1001A or supplier B with material code 1001B can be used, with priority given to A.

[DerekDing]

Yes, if you use the FFF Material, you should create a new material as a Main material. And for the other materials, there is not priority for them, you should specify the material by manual.