I had recently encountered a COM error in SCM APO and wasted a lot of time trying to figure out what the error code actually meant.
If you ever have this issue, you can use transaction /SAPAPO/OM10 to resolve any COM routine error message.
You can also check the message class /SAPAPO/OM_TS and possibly some other /SAPAPO/OM* message classes as well. This is where the error message descriptions are coming from.
Hope this helps.