Change Profit Center in FI/CO document for Network or WBs

Question

The client does not want to change the profit center assignment on the network or WBS.
Finance would like the ability to change the profit center when the FI/CO document is created.
When trying a FI or CO substitution , we keep getting an error message stating that the profit center cannot be changed on the object.
The account assignment from the object will overrride any attempt to change the profit center via substitution.
Does anyone know a solution to the problem.
We are investigating adding an enhancement when the error message is called. 
Thank you,
Jeffrey

Answer 1

But, have you maintained 3KEI settings for derivation. This would give you additional flexibility to define your default account assignments. If still 3KEI is not sufficient, you can try amending the following message KI399 in OBA5. Before, making changes, you should know the implication. My question is what is the business need to change the Profit Center. Why cannot the users enter the correct WBS Element / Order, which contains the correct profit center?
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Following is the help.
Message no. KI339
Diagnosis
You entered profit center FD999 or transferred it from a previous transaction, such as material receipt from an external order. However, the system derived profit center DUMMY from the account assignments.
System Response
The system automatically determines the profit center from the assigned profitability segment, cost center, order, project, network, sales order, or cost objects. This overrides the profit center you entered manually.
Procedure
To post the data to profit center FD999, assign the profitability segment, cost center or other object to that profit center as well.
If the posting to profit center DUMMY is correct, no further action is necessary.
This message is sent as an error in the standard system. You can make the message a warning or deactivate it entirely in Customizing. Use the Implementation Guide under "Controlling: General" and choose Change message control. Enter area KI and message number 339.