Strange Problem in consuming a Web Service

Hi Experts,

I am facing a strange problem.

I have exposed a function module as a web service. It returns a list of material numbers.

When I execute it in SAP, it works fine. But when the external application (a ruby program) calls the web service it returns the table as blank.

I have used the structure “BAPIMATLST” and passing the data under the Tables tab of function module.

Regards,

Gopal