Dear Debasis Nanda,
I faced a similar issue can u please check the mentioned two materials has same base unit of measure say EA in your current scenario.
Let me brief you about the problem I faced.
Material A is has BOM B & C similarly
material B is has BOM D & E . The base unit of measure of D was maintained as Ton but for all other materials it was maintained as KGS.
Because of this the overall scheduling of orders varied tremendously .
Please revert if clue was helpful .
Highly appreciate yours rewards.
Thanks & Regards
Arvind Pabba