Config Check During IDOC Processing

Hello experts:

I am attempting to extend a material to a plant with IDOC. I can get it to work, however I was bumping into required fields that I do not see, and are not altered to, being required when I enter values manually in SAP.

For example if extend data to the MRP2 tab manually, I am not told any fields are required and I can save with no problem. When I extend with the IDOC, if says a field is required. Once I provide it iin the IDoc it works.

Is there some kind of different IDoc cofig check that happen that are hidden when you enter data into SAP manually?

Thanks all.