Budget Control for BCS in Fund Management vs. Internal Order

Hello Folks,

I have a question for the budget control function between BCS in FM and Internal Order.

We are now planning to implement BCS for general expense and Internal Order for certain projects.

Namely, when we spent some money for business meal for general purpose, that amount will be posted into certain cost center.

On the other hand, when we spent the money for business meal for certain project, it will be posted into certain internal order.

As we know, both BCS and I/O have the budget control function individually.

The problem on above is as follows.

When I want to post project cost into internal order, the system wants me to enter cost center code.

So I have created the derivation rule of cost center for internal order, and then above error message is disappeared.

But when I entered that expense line item, the budget is checked not by internal order but by BCS even though I have already entered related internal order.

Could someone tell me how to check the budget amount in the same expense account with BCS and I/O function?

PS: The budget control of BCS function is working properly in any case.

Thanks.

BR,

Chris Kim