We have a Biztalk web service that simply takes a parameter in,
concatenates some text, and returns the concatenated string. When this
web service is called from .net or from web service studio the
webservice works perfectly. However, when I connect this as a data
source within sharepoint designer, I can see the returned variable name
but there is no value. We have modeled the webservice to look exactly
(line for line) like another web service that's none biztalk that does
return expected data and we still can't get the web service to return
data to SP Designer.

Has anyone seen something like this? When the data comes in it seems
to get lost in the pipeline before it gets biztalk somewhere. What
baffles us is that it works fine when called from a .net app, it only
behaves this way when working withing SharePoint designer. If we edit
string by adding TEST inside of the mapper it will return that. So we
know that data can be returned from the webservice however the
parameters are not making it into biztalk as advanced by messages from
the health and activity tracking.