There is a assignment to Internal Order in VF03, But still it posts to Cost Center? Why?

hello All,

Here Assigned to Internal Order:

The Internal Order status is released and it is real order.There is also a check for revenue postings too.

There is no assignment in OKB9 for the cost element to cost center and as well in cost element master data. (Cost element category is 1)

Why the amount is still posting to Cost Center.

Kindly Help me.