In SupplierMaintenance.wsdl file look for name space task
<xsd:import namespace="http://xmlns.oracle.com/bpel/workflow/task" ............/>
check the schemaLocation attribute in the above element. Correct it and it should resolve your issue.
Ideally it should be
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Target Namespace mismatch issue usually happens if the namespace declared and the one imported does not match.
Did you try to compare the schema namespace and the one declared in wsdl?