How can I test my Query As A Web Service?

Hi,guru:

    I have created my Web Service based on universe which based on SAP BW query using Query As A Web Service Designer, but when I use it in Dashboard on BOBJ platform by passing a parameter to the Web Service, it seems no response from the Server,I made 2 test steps:

    1.Pass a value to the input parameter,I checked by ST01 in BW Server and see no records of the action, and no result return.

    2.Pass a blank to the input parameter,I checked by ST01 in BW Server and got many records,and all data be retrived.

    It seems that when I passed the parameter,the Web Service seems no response and didn't run at all. Is there anybody who can tell me how can I test the Web Service,I want to test it and input my parameter.

    Thanks very much for your quick response.

Best Regards

Martin Xie