"GetPropertyValue" function is ASI COMMON SERVICES

Hi there,

I am trying to use "GetPropertyValue" method from  ASICOMMON SERVICES (iMIS 15.1) available in http://webserver_name/imis15/asicommon/services/membership/membershipwebservice.asmx to return the First_Name and Last_Name of the member account. Which apparently not returning these.

Can someone please assist?

Thank you in advance.