FYI ping.
Don't know much about this, but something stinks.
The Serb argument is that the Croatian government took land which was legally Serb, since the government of Communist Yugoslavia was the legitimate government at the time and that some of the land in question had previously been inhabited by Serbs centuries before, and that other portions of the land had been Serb before the Pavelic regime. They also argue that the 150 people mentioned were noncombatant civilians.
I'll also point out that the Roman Catholic Church does not have full control over the Franciscan order in Croatia - a large portion of the order in Croatia broke with the local bishops in the early 90s and have refused to even let the bishops or their representatives set foot in a number of Franciscan friaries.