An error occurred when parsing the incoming document

We meet like this error when was connected other system.

Reason: An error occurred when parsing the incoming document: "'.', hexadecimal value 0x00, is an invalid character. Line 1, position 76531."

This error is include unicode in xml data. we must removed unicode.

XML standard characters. look at refrenece.
http://www.w3.org/TR/2004/REC-xml11-20040204/#charsets

Character Range
[2] Char ::= [#x1-#xD7FF] [#xE000-#xFFFD] [#x10000-#x10FFFF]
/* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
[2a] RestrictedChar ::= [#x1-#x8] [#xB-#xC] [#xE-#x1F] [#x7F-#x84] [#x86-#x9F]

thanks.

At least release the BizTalk Server 2004 SP2

Microsoft BizTalk Server 2004 Service Pack 2 contains many important fixes. In addition, a new feature called Archiving and Purging has been added which can automatically manage both the purging and the archiving of the tracking database. Some of the most important fixes that are included in this service pack are:

Performance issues with different orchestration scenarios

EDI transmit fails with certain structures of outgoing messages

Disassembling large flat file messages in the pipeline stalls other processing

The rules engine is not honoring rule priorities correctly in high load

Body tracking doesn’t track the original message

Dynamic send ports causing 10 second delay in subscription

100% CPU in orchestration when calling PrepareForActivationComplete

Messages could still be delivered even though the orchestration instances were zombied

Connection problems with HTTP Request-response requests

Request to turn off FTP Throttling

Memory Leak problem in PipelineContextWrapper/Interop.ResourceTrackerbr

IMPORTANT: BizTalk Server 2004 SP2 is not compatible with BizTalk Server 2002 and BizTalk Server 2000 systems.
Please be sure to read and review the SP2 documentation before installing SP2.

Download the link.
BizTalk Server Service Pack 2 (EN)