Capturing a system error from a FM

Question

I'm adding/deleting/updating records in KNMT via the RV_CUSTOMER_MATERIAL_UPDATE function module.  I'm trying to find a way to catch the errors from this function module.  For example, if I try to insert a material that already exists, I get a "System error during INSERT (table KNMT subrc 4)" error and it stops the program.  What I want to do is collect that error, write a message to the screen, and go on to the next record to insert/delete/update/etc.  There are no exceptions to the FM so I'm not sure how i'm supposed to do it.  I've tried a TRY/CATCH with a cx_root.  I've also tried using the FMs MESSAGES_INITIALIZE and MESSAGES_GIVE but I can get them to work.  Can anyone point me in the right direction?
Thanks,
CD

Answer 1

Hi,
Let me give you some more details then, if further questions arised. I offerd an almost-ready-to-use code for the FM mentioned in the initial question. But the addition of
EXCEPTIONS
    ERROR_MESSAGE = 1.
works for every function module you could use. In my case the FM PRELIMINARY_POSTING_FB01 that I was calling from my custom code, used to raise a message type 'E' in some cases. But I did not want that message to interrupt the execution of my code. Instead of that, I caught the error and handled it myself. And ERROR_MESSAGE = 1 got the job done. So I think you should give it a try
Hope this helps,
Grzegorz