BizTalk 2010, Circular type reference with Spec2000 Xsd

Question

Hello,
For a electronic invoices solution, we are using the Spec2000 standard.
My invoice schema "ATA_SparesInvoice.xsd"
Includes "MM_CommonTypes.xsd"
Which includes "CSDD_MM.xsd"
Which includes "ATA_CommonTypes.xsd"
I am receiving ATA_SparesInvoice from our supplier without any problem through an HTTP receive-send port using XML pipeline.
But I'm now trying to send a ATA_SparesInvoice message through an HTTP POST send port, and I get the following error:
"There was a failure executing the send pipeline: "Microsoft.BizTalk.DefaultPipelines.XMLTransmit, Microsoft.BizTalk.DefaultPipelines, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Source: "XML assembler" Send
Port: "EDI_ResubmitInvoice_HTTP" URI: "http://server.domain/CHC.EDI.Submit/BTSHTTPReceive.dll?Invoice" Reason: Circular type reference."
There are a lot of types in the schema, do you know any tools that could validate the schema and pinpoint the circular reference?
Do you know why am I receiving the error only in the XMLTransmit pipeline and not in the XMLReceive?
One option I have is to remove the "include" and to replace the element ref by the actual base types. But all changes will be lost when schema will be updated to a newer version.
Any other suggestions on how to solve this?
Thank you :)

Answer 1

Hi,
Can you try to use the PassThru pipeline on this send port instead of XMLTransmit and share the results. It should not give you this error if
you use PassThru pipeline.
You only need to use XML Transmit when you want to promote any of the to-be-send messages to the context. If you don’t need
to promote any value while sending, then you can use PassThru transmit.
Your issue due to the circular import problem where one schema imports another
XSD schema, and vice versa. 
Rachit
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