Hi,
Your question is not clear.. but still I will answer your questions based on the understanding I had...
One plant A produce the Finished good and sent to other plant B as Raw material
In plant A for the material in the material master maintain Procurement type as E and in the plant B maintain the same as F. Now create plant A as the vendor for the plant B and maintain info record for the same. One more option is create special procurement in plant B for the material as stock transfer from plant A.
One plant A produce the finished goods and may not sent the material to other plant B due to some issue...
What is the issue here...and nothing to maintain here
If plant A will not sent the material to plant B then plant B will procure the material.
Create vendor masters and info records..
During MRP system creates Purchase requistions and while converting you need to select the vendor in our case plant A or external vendor....
It would be better if you post this question in MM forum...
Thanks
Kumar