Was his father "Klonimus Kalman Babad" (Klonimus Kalman Babad), as his tree suggests? Or, was the father "Avraham Yehoshua Heshel", as the title suggests?
Shulem - there is clearly some confusion there. At the moment his grandfather Yona Ha-Ashkenazi of Regensburg has the same title as he has.
There are some issues with dates too. He is currently shown living to 1110 (though with conflicting data).
I don't know the paternal line of Tzvi Hersch. I had found information at this site http://akevoth.org/family_tree/family_tree.htm but I can't attest to it's reliability.
It's pretty clear that Yona Ha-Ashkenazi of Regensburg is NOT the "Issur V'Heter" - so I have changed his title to match.
It his grandson http://www.geni.com/people/Rabbi-Yona-Kalman-Babad-Ha-Ashkenazi-Iss... who wrote "Issur V'Heter" - that being the profile on which this discussion started.