EDIFACT Receive Schema Discovery in TPE is not working by biztalk2010

Hi,

I fear the schema discovery for EDIFACT messages is not working properly in BizTalk 2010.

I receive following EDIFACT message through the EDI Pipeline:

UNB+UNOA:3+SENDER:ZZZ+RECEIVER:ZZZ+110721:0612+2011028745++++++0'UNH+028745+ORDERS:D:96A:UN:EGC103'...

The message is correctly asigned to the right TPE business agreement. In the "Transaction Set Settings" - "Transaction Set List" I configured a default namespace and another namespace which is related to the message above (the second item in the sceenshot):

The problem is, that this message is not recognized as the correct schema, so it's always assigned to the default namespace. I checked all the properties (ORDERS, D, 96A, EGC103), but the schema discovery does not work.

It seems, that the UNG segemts need to be filled, but this segments a not used in most of EDIFACT scenarios.