Why does this error happen?
- This error is shown while posting MIRO document.
- It will be displayed when the derivation strategy overwrites the WRX line with another account assignment than the one existing in the PO.
- This is done to ensure the whole chain of documents (PO-GR-IR) have the same account assignment and it is consistent.
- This may happen with any of the account assignemnts:
- Commitment item
- Funds center
- Budget period
- Functional Area
- Funded program
Locating error in FMDERIVE trace
To detect the error it is needed to compare the account assignment that has been posted in the PO (transaction ME23N or FMIOI table) and the one that is being derived in the FMDERIVE.
In this case, in ME23N:
And the FMDERIVE trace:
As the FMDERIVE trace is displayes several times, we need to focus in the one that:
Transaction = WRX
Ref transaction = RMRP
Process Detail = IR_CLR
In this case, we can see the funds center is different in the FMDERIVE and the ME23N, so this field is causing the error.
In FMDERIVE it is 10201 and in ME23N it is 10101.
Detecting the erroneous step
At the time FMDERIVE is displayed the different account assignment (in this case the funds center) we need to check the step that is causing this mismatch. So, we will need to open the log for the FMDERIVE and detect the one that is overwritting the funds center. Normally the steps will have an "overwrite target value" condition.
Fixing the error
There are several ways to fix the error depending on your business processes and the way MIRO must be updated.
First of all it is necessary to decide whether we want the MIRO is updated wiht the same account assignment that exists in PO or not.
- If the account assignment must be the same in PO and MIRO:
Then the best way is to use the Function Module FMDT_READ_PO_ASSIGNMENT. This way the account assignment is directly read from the PO.
Example in FMDERIVE:
In this case would be PO document number, line item and account assignmnet number.
It is necessary to set as "overwrite with new value" to ensure the value from the PO is the one taken.
Condition: There it is necessary to limit this derivation rule only when the process is IR_CLR (as we are processing MIRO)
- If the account assigment must be / can be different in PO and MIRO:
Then it is possible to turn the FICUSTOM401 into warning. But ALWAYS taking into account if its turned into warning or supressed, it will be for all postings from that moment on.
For more info, refer to note 2491908 FICUSTOM401: FMDERIVE Consistency Check 01 error during WRX RMRP