How to find code responsible Error Message generated in MIRO transaction

Question

Hi Gurus,
                I have to find the code responsible for generating ERROR message in Miro tcode through DEBUGGING. Let me tell you the case...................
In MIRO,
We input
In Basic data tab,
Invoice Date,
Posting Date,
Reference,
PO no. &
Tax code as V5 ( VAT @ 8% )  in item data  & then
In Details tab,
We enter Business Area    & then
In Payment Tab
Baseline date        & then
In Basic data tab
We check the check box for Calculate tax &
entered Amount     & then click entered .
It displays GREEN button.
When we click Simulate button & click post then it shows 1 message that " Invoice document still contains messages .".
And then if we click Messages Button it shows " MSG No. & text -  Enter Bussiness area ."
So the problem is though we input Business Area , still it shows message Enter Business area.
So plz tell me how to find that code responsible for error message.

Answer 1

Ashish- It is because, the error message is called using function module / BAPI. But Ideally when a developer codes to populate the structure of type BAPIRET2, he.she should also follow the following rule, to make the message traceable:
"Populate BAPI structure for error message
"Following code will not get called, but is for documentation for traceability.
if 1 = 2.
  message e004.
endif.
That is why i said in my comment, if it is "coded properly" then we will be able trace
Bottom line: you will not be able to find the program line using this approach.
But now since you now the error message and number, you can go to the underlying program of MIRO (SAPLMR1M and SAPLFDCB)..click on the find button on the application toolbar, enter the message# and find..PLEASE SELECT THE RADIO BUTTON "In the main program".
Hope this helps.
Sajan Joseph.