Co product actual cost is showing zero in KKBC_ORD

Hi Team,

After GR process, why GR & co product material Y actual cost is showing zero in KKBC_ORD t-code?

Material X is main header material
Material Y is Co product

Material master settings
Material X is having the check mark as co-product and also maintained with approtionment structure.
Material Y is having the check mark as co-product and not maintained with approtionment structure

BOM settings
Material Y is maintained with negative quantity with check mark as co-product.

Please help me on this issue wether I am missing any settings either in master data or configuration.

co-product-actual-cost-zero.png

Best Regards,
Syed Taseer