Refreshing BEX query DataSource with Variables in the script

All, We are on SAP Business Objects Design Studio 1.3 SP1. I am using BEX queries in my SAP BusinessObjects Design Studio application. I would like to refresh DataSource with setting the Variable values through the script.

I am using APPLICATION.setVariableValueExt property to set the values

I am using DS_NS_SUMMARY.reloadData() method to reload data.

Very first time when I refresh it will work fine. when I change prompt values and refresh it's taking same old prompt values not new values.

Please anyone have any work around please share.

Thanks,

Pad