Calling SAP Transaction from WDA in the same window
I could acomplish what you wanted in the below way.
First i took a link to URL fields and an Iframe in my view , Then i built the URL and passed it in to a Attribute of type string and asisgne that attribute to the IFrame source .
So when we click on the Link to URL then it will open the Tcode in the Iframe with out any issue .
Hope this helps.