Changing IDOC function module?

Question

Hello everyone!
I would like to make changes to the function module responsible for creating Sales Order Idocs: IDOC_INPUT_ORDERS. How should I go about this procedure? Do I need to copy the existing function module and create a new one? If so, how do I point the IDOC (ORDERS05) to the new function module (for example, ZIDOC_INPUT_ORDERS).
Thanks in advance!
Warm regards,
Glenn

Answer 1

> I would like to make changes to the function module responsible for creating Sales
> Order Idocs: IDOC_INPUT_ORDERS. How should I go about this procedure?
> Do I need to copy the existing function module and create a new one?
(1)This is one possible solution, another one is to use some (2)customer function exits for inbound Idoc – these enhancements might be useful: MM06E001, VEDA0001or (depending on platform you are) you might go for e.g. (3)“Implicit enhancement”. In last two cases you probably don’t need to create Z-FM and Z-process code.
> If so, how do I point the IDOC (ORDERS05) to the new function module (for
> example, ZIDOC_INPUT_ORDERS).
1) Copy FM to ZFM
2) Specify characteristic of FM – BD51
3) Create Z-inbound process code: WE42 and assign a Z-FM to it.
4) Assign FM to message type – WE57
>If you have any other information on how to properly edit the IDOC function
> module (for example, adding ABAP checking codes before populating the IDOC
> fields) it would be great if you could share them!
To add some checks at the beginning you might use all three possible solutions:
(1) in ZFM you might add you code at the very beginning and return some error message
(2) you might use on of the available customer function exits to do some checks
(3) you can do the implicit enhancement and also return some error code at the very beginning of standard FM
In both cases I recommend to go for approach no (2). Useful tcodes: CMOD and SMOD.
Regards,
Jakub