Hi, we are doing a PoC to load a Pega 6.2 case into a Pega 7.2.1 harness (we want to display the case in a Pega 7.2.1 tab in the case user portal) using Pega 6.2 IAC.  We are able to display the case successfully, but some buttons, such as the Submit button, did not work because of Javascript error:

pega_desktop_domainsuffix_1819019784.js!clientlogbase_11632504602.js!pega_yui_13966702622!desktopwr…:17534 Uncaught DOMException: Blocked a frame with origin "< domain> " from accessing a cross-origin frame

It looks like by pressing the "Submit" button inside the Pega 6.2 frame, the chain of Pega JS call eventually hits a Pega 7.2 JS function, instead of what's the Pega 6.2 version.

Any idea how we can get around this problem?