SoapExecute Workday Read Get Course Sections fails with error message 'Course_Section_Reference is required' when it actually exists in the request

I am attempting to get a web service response from workday, but hitting an error which does not make sense to me
error: Course_Section_Reference’ is required, on internal element 'Course Section Request References

There is no ‘Course Section Request References’ section, only a ‘Request References’ section which I do have populated:
image

My pipeline snaps…
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The wsdl: https://wd5-impl-services1.workday.com/ccx/service/mytenant/Student_Records/v35.0?wsdl
The operation: {urn:com.workday/bsvc/Student_Records}Get_Course_Sections

The custom envelope:
<SOAP-ENV:Envelope
xmlns:SOAP-ENV=“http://schemas.xmlsoap.org/soap/envelope/
xmlns:ns0=“urn:com.workday/bsvc”>
SOAP-ENV:Header
ns0:Workday_Common_Header
ns0:Include_Reference_Descriptors_In_Response$Include_Reference_Descriptors_In_Response</ns0:Include_Reference_Descriptors_In_Response>
</ns0:Workday_Common_Header>
</SOAP-ENV:Header>
SOAP-ENV:Body
<ns0:Get_Course_Sections_Request ns0:version="$version">
ns0:Request_References#foreach($Course_Section_Reference in $Request_References.Course_Section_Reference)
<ns0:Course_Section_Reference ns0:Descriptor="$Course_Section_Reference.Descriptor">#foreach($ID in $Course_Section_Reference.ID)
<ns0:ID ns0:type="$ID.type">$ID.value</ns0:ID>#end
</ns0:Course_Section_Reference>#end
</ns0:Request_References>
ns0:Request_Criteria
<ns0:Course_Reference ns0:Descriptor="$Request_Criteria.Course_Reference.Descriptor">#foreach($ID in $Request_Criteria.Course_Reference.ID)
<ns0:ID ns0:type="$ID.type">$ID.value</ns0:ID>#end
</ns0:Course_Reference>
<ns0:Section_Listing_Reference ns0:Descriptor="$Request_Criteria.Section_Listing_Reference.Descriptor">#foreach($ID in $Request_Criteria.Section_Listing_Reference.ID)
<ns0:ID ns0:type="$ID.type">$ID.value</ns0:ID>#end
</ns0:Section_Listing_Reference>#foreach($Section_Status_Reference in $Request_Criteria.Section_Status_Reference)
<ns0:Section_Status_Reference ns0:Descriptor="$Section_Status_Reference.Descriptor">#foreach($ID in $Section_Status_Reference.ID)
<ns0:ID ns0:type="$ID.type">$ID.value</ns0:ID>#end
</ns0:Section_Status_Reference>#end#foreach($Academic_Period_Reference in $Request_Criteria.Academic_Period_Reference)
<ns0:Academic_Period_Reference ns0:Descriptor="$Academic_Period_Reference.Descriptor">#foreach($ID in $Academic_Period_Reference.ID)
<ns0:ID ns0:type="$ID.type">$ID.value</ns0:ID>#end
</ns0:Academic_Period_Reference>#end
ns0:Start_Date$Request_Criteria.Start_Date</ns0:Start_Date>
ns0:End_Date$Request_Criteria.End_Date</ns0:End_Date>
</ns0:Request_Criteria>
ns0:Response_Filter
ns0:As_Of_Effective_Date$Response_Filter.As_Of_Effective_Date</ns0:As_Of_Effective_Date>
ns0:As_Of_Entry_DateTime$Response_Filter.As_Of_Entry_DateTime</ns0:As_Of_Entry_DateTime>
ns0:Page$Response_Filter.Page</ns0:Page>
ns0:Count$Response_Filter.Count</ns0:Count>
</ns0:Response_Filter>
</ns0:Get_Course_Sections_Request>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

My mapper:

btw… My request works with the same values from the workday web service tester, via xml as shown:
image