Dear Vimal,
There are 5 options available in VKOA
According to screen shot ,You have to Assign the G/l in VKOA with Account key maintain in Pricing Procedure, Material Account group.
to avoid duplication or error you need maintain only in one combination. I would suggest , check your VKOA with other options as well.
Hope you are clear now..
All d best.
Regards,