Unable to import XML schema – Error ‘no type has been selected for the scheme element’

Symptom

Unable to import an XML schema into the output step of an MMO (Multi Message Operation) during the creation of a web service connector task. The following error is displayed:

no type has been selected for the scheme element

Cause

TaskCentre does not support a schema which contains attributes.

Resolution

When defining MMO input and output data structures, only nodes (ComplexTypes) and elements (SimpleTypes) can be used.