Invalid char in XML from inbound IDoc

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I am trying to send a CREMDM IDoc from a 4.6C R/3 system to an XI SP09 system. The IDoc gets sent from the backend system, shows up fine in WE05, but after it gets passed to XI, I encounter a fatal error (in SXMB_MONI) that reads:

com.sap.aii.utilxi.misc.api.BaseRuntimeException: Fatal Error: com.sap.engine.lib.xml.parser.ParserException: Invalid char #0x15(:main:, row:1, col:986) at com.sap.aii.mappingtool.tf3.Transformer.checkParserException(Transformer.java:41) at com.sap.aii.mappingtool.tf3.Transformer.start(Transformer.java:66) ....

Upon checking the payload, I discover an "#" character in one of the fields (at position 986) has mysteriously been transformed to a " " character. XI does not recognize this character and the parser fails.

As I understand, the R/3 system is non-unicode, and XI being unicode could be causing the problem. However, I have no clue how to solve this issue. Deeply appreciate it if any ALE/XI experts can share any insights.

Regards,

Danny