PE_GetSelectedItems

I am newbie in Aras so maybe I am missing something here. I am using the PE_GetSelectedItems  method to call an action one time on multi select of my grid items. I am able to acheive this on my main grid . However I am facing an error when it come to the relation ship grid. The action method gets called again and again for each Item selected. Please help. Note : I am facing this issue only in chrome. It is working fine in IE.
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