IDoc to IDOC, Message Mapping settings

Hi!

I am going to implement IDoc to IDOC scenario.

The IDOC should be send from SAP ECC 6.0 system, client 100 to the same system in client 200 via SAP XI.

I have chosen the message type MATMAS05.

Questions

- What is the minimal message scenario (MATMAS:MATMAS05 to MATMAS.MATMAS05) in message mapping?

- when I change some mapping attributes do I need to activate the other related objects (e.g. Interface Mapping, etc.)?

My problem is that the IDOC will be received in SAP XI, but has the following error:

Error: must node 'E1MARAM' failed in structue MATMAS05

How can i correct this error?

Thank you very much!

regards

Holger