SAP Decode error / Invalid IDoc XML document: Only segments are allowed on top level

Good morning everybody,
we changed our SAP-System to allow Unicode (SAP- codepage 4103).
During testing we found out that Integration Server 6.5 can handle Unicode BUT not our SAP-Adater 4.6. So we migrated to 6.5. After the third day we are now able to load new WMSAP- package without errors and I created RFC connections like on Version 4.6 (which is deleeted/uninstalled).

After I substituted old services by actual 6.5 one (pub.sap.idoc:decode and pub.sap.transport.ALE:OutboundProcess) I get the following error when decoding an ORDERS05 message: "com.wm.util.coder.InvalidDatatypeException: WmSAP Adapter: Invalid IDoc XML document: Only segments are allowed on top level, found non-segment “E1EDK14”. "
Interesting is that a MATMAS03 message goes through the same decode-service and it’s working.

Does anyone of you have an idea?