SOAP UI is giving error when the WSDL containing import statements. For this error you have replace your import statement with content of the file that you are trying to import.
Here I am giving example
targetNamespace="http://abc.def.com/"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://abc.def.com/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:types="http://abc.def.com/"
>
(only this line needs to be replaced with defination of input.xsd)
change to as following...
targetNamespace="http://abc.def.com/"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://abc.def.com/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:types="http://abc.def.com/"
>
------your schema defination..................
Try this let me know ....