BAPI_TRIP_CREATE_FROM_DATA works in SE37, but not from external program

Question

BAPI_TRIP_CREATE_FROM_DATA works in SE37, but gives error when calling from external program.
The error is "Deserialisation failed". I have the WSDL generated by a Web Service wizard in SE 37,
so there should not be any problem like element name or case(upper/lower) mismatch etc. I populate all mandatory fields.
I am using the web service created by wizard in a InfoPath form.
This is the exact error:
The SOAP response indicates that an error occurred:
Deserialisation failed

Answer 1

Thanks for this pointer. I downloaded the code and looked at the same. It very useful as conceptual and coding guidance. However, there are many BAPis working in our product already, only a few return the same error "Deserialisation failed" The sample you pointed out uses BAPI_FLTRIP_CREATE but we have problem with the following BAPIs:
BAPI_TRIP_CREATE_FROM_DATA
BAPI_ADDRESSEMP_CREATE
BAPI_FAMILY_CREATE
All of them give error similar to following:
Deserialisation failed
<detail>
    <n0:SimpleTransformationFault xmlns:n0="http://www.sap.com/transformation-templates">
                <MainName>/1BCDWB/WSS0071212021944898000</MainName>
                <ProgName>/1BCDWB/WSS0071212021944898000</ProgName>
                <Line>170 </Line>
                <Valid>X</Valid>
                <ReferenceFault>
                                <DescriptionText>Error accessing the ref. node 'EMPLOYEENUMBER'</DescriptionText>
                                <RefName>EMPLOYEENUMBER</RefName>
                </ReferenceFault>
                <Caller>
                                <Class>CL_SRG_RFC_PROXY_CONTEXT</Class>
                                <Method>IF_SXML_PART~DECODE</Method><Positions>1 </Positions>
                </Caller>
   </n0:SimpleTransformationFault>
</detail>
Any more suggestions are most welcome and highly appreciated.