ABAP Coding in Consumer Proxy

I Created a Client Proxy using WSDL file and all the methods are generated into sap, Now I have created report with the Proxy and using the Proxy-method search_vendor to retrieve the vendor details so Iu2019m sending vendor no as input to this method I tried to write the code in Proxy method to retrieve the details Here Iu2019m facing the issue that unable to edit the Proxy-Method. How to handle this operation?

Example Report fromat

Proxy_Class->search_vendor(

EXPORTING

input = input

IMPORTING

output = output

Please Provide your valuable inputs to me.