How can i pass integer,long and datetime datatype to a webservice

Hi Team,

I am trying to create a simple webservice in powerbuilder 12.5.1. I have created a function of_function_return of return type String.It takes one argument as integer.Please find the image below.

After that i delpoyed this an local iis server and a webservice generated.

Now i am accessing this newly created webservice in powerbuilder classic in a webservice datawindow.

Here its is showing as two aruguments ( dont know why).Now i have selected the return value.The below issue is coming.

Is there any limitation that in input parameter we should only pass string variables.

please help on this.

Regards

Subrat