Hi Prem,
From the error above, I am not able to make out which message it is : INVOIC, PRICAT???
Nevertheless, I will explain how it should look :
1. Go to EANCOM message editor
2.If you see below I have created PRICAT93AEAN006 message and this is reflected in the dropdown box in the EANCOM message editor. I am assuming you have PRICAT message.Therefore you should create a control key (Example PRICAT96AEAN007 and this you should be able to see in the dropdown box)..Make step 3 setting also to be able to see it
3.Go to Control key association
Create an entry for your PRICAT96AEAN007 message just as i have created for PRICAT93AEAN006
4. Go to Control key description. You should see the following entry automatically. Once you create a control key. If you dont see it, ask SAP to put this for you via OSS message. This is the most important table for which we customers do not have access
5. Manually edit the tables below to align the Interface index and Contorl key in all tables. ( Please be careful while doing..A small mistake may affect a lot of things)
Hope this helps.
Thanks
Saurabh