change of wsdl without affecting test suite operation

Hi,

I have a test suite and i want to change its wsdl without affecting the test suite execuiton. New wsdl will have the same operations as in the old one with just small differences in the operations.

I tried cloning the test suite and then changing the operation of each test request by selecting the new interface (by right clicking on the test request and selecting "change operaiton"). However it didn't work. What else should I do?

Thanks.