Well, I have begun to wildly guess around now. As the OFBIZ Developer
Beginners Guide seems to differ a lot from the Service Engine guide
explanation of service groups. I have now tried the following:


                <service name="createCategoryI18nAndRollupi" engine="group" 
auth="true">
                    <description>Creates a party, person and party role
Client</description>
                    <group>
                        <invoke name="createCategoryI18n" 
result-to-context="true" />
                        <invoke name="addProductCategoryToCategory" />
                    </group>
                </service>

I added the above to the service.xml file and removed the service_groups.xml
file altogether. That was, at least, what any example I could find would
do... but, the error I receive remains: 




The Following Errors Occurred:
The following required parameter is missing:
[createCategoryI18nAndRollupi.productCategoryId]


This doesn't make any sense anymore...
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