Newbie mapping trouble (cXML OrderRequest to Generic PO)...compiler links

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Hello,

I'm a BTS newbie. I'm trying to create a map between a cXML OrderRequest
and a homegrown generic PO (very simple structure that I can change in any
way that is necessary). When I try to 'Test Map', I get an error and some
warnings:
================================================
Warning 1 The required field "Address2" has no incoming link, constant
value, or default value. C:\cXMLSample\cXMLPO_To_GenericPO.btm
Warning 2 The destination node "ShipToID" is required but the source node
"addressID" is optional. C:\cXMLSample\cXMLPO_To_GenericPO.btm
Warning 3 The destination node "LineNumber" is required but the source node
"lineNumber" is optional. C:\cXMLSample\cXMLPO_To_GenericPO.btm
Warning 4 Double-click here to show/hide compiler links.
C:\cXMLSample\cXMLPO_To_GenericPO.btm
Warning 5 Test Map used the following file:
<file:///C:\cXMLSample\Samples\OrderRequest.xml> as input to the map.
Error 6 Output validation error: Root element is missing. C:\Documents and
Settings\Josh\Local Settings\Temp\_MapData\cXMLPO_To_GenericPO_output.xml
Warning 7 Test Map failure for map file
<file:///C:\cXMLSample\cXMLPO_To_GenericPO.btm>. The output is stored in the
following file: <file:///C:\Documents and Settings\Josh\Local
Settings\Temp\_MapData\cXMLPO_To_GenericPO_output.xml>

================================================

Here is a link to a screenshot that shows the BizTalk map:

http://picasaweb.google.com/josh.blair/BizTalkScreenshots/photo#5039996324107117874

<a
href="http://picasaweb.google.com/josh.blair/BizTalkScreenshots/photo#5039996324107117874";><img
src="http://lh3.google.com/image/josh.blair/RfGp9Cet5TI/AAAAAAAAAAg/eg8OfpunW3E/s144/biztalk_mapping_compiler_links.jpg";
/></a>
When I double click on the first warning to show the compiler links, there
are many red dotted links that go from various elements of the source schema
to the elements in the destination schema. I have tried to create matching
links be connecting these source destination elements but that causes more
errors like:

=================================================
Warning 1 The destination node "Header" has multiple inputs but none of its
ancestors is connected to a looping functoid.
C:\cXMLSample\cXMLPO_To_GenericPO.btm
Warning 2 Double-click here to show/hide compiler links.
C:\cXMLSample\cXMLPO_To_GenericPO.btm
.. . . .
=================================================

I haven't been able to find any documentation on how the "implied" compiler
links work and how to work around the issue. I have done all the tutorials
and many examples in the current BTS2006 books and none of those maps ever
had these issues. Typical eh?

Is this issue a result of a poorly designed destination scema? What I am
trying to accomplish with this prototype is to map different incoming
purchase order schemas (cXML, csv, homegrown XML, etc.) to a simple generic
internal po schema that my orchestrations can deal with. Maybe this is a
bad design. Any insight is appreciated.

Thanks for your assistance,

Josh Blair
Golden, CO



.

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