Customizing ShowSelection Method in PR not working in IP20.3

Hello All,

We are observing strange behavior Open UI Scripts written in IP15 are not working in IP20.3 version.

One example is below.

We have a custom PR written for form applet., in which ShowSelection method is added.

Sample Code Line:

esi_sr_popup_form_applet_pr.prototype.ShowSelection = function () {     SiebelAppFacade.esi_sr_popup_form_applet_pr.superclass.ShowSelection.apply(this,arguments)     //console.log("dfsdfsfs: "+this.GetPM().Get("ProdNameChanged"));}

Above script is working in IP15 but causing in IP20.3, apart from above method we have ShowUI, BindEvents also in the script file which has no issues., please find attached error below if we have above method customized.