URL parameter displays previou

I have a page with has link to other webcenter page

Parameter value in the link changes based on a drop down in the page

First  time the link is hit the data is displayed correctly

after changing the drop down value the URL is point to same page with different parameter

On click the link subsequent time previous data is getting display. The page is not getting refreshed.

I have tried adding RefreshCondition="#{bindings.paySlipId != null}" in the taskflow under with the portlet is executed.

However still same behaviour

Page definition

<?xml version='1.0' encoding='UTF-8'?>

<pageDefinition xmlns="