[fpc-pascal] Problem accessing Class Method with abstraction

[Andrew Brunner]

I've got a class factory problem I'm trying to resolve and it appears
I'm at a point where it's probably better to ask for help.

  TCoreObjects=class;
  TCoreObject=Class (TPersistent)
  protected
    class procedure VerifyIDs(var Module:TDBMSModule); Virtual; abstract;
  end;
  TAdminCore=Class(TCoreObject)
  protected
    class procedure VerifiyIDs(var Module:TDBMSModule); override;
  end;

<SNIP>

procedure VerifyIDs(Var Module:TDBMSModule);
var
  iLcv:integer;
  ItemP:PCoreObjectItem; // Just record storing classname to load and
(each core object implment is loaded just not detailed here for
simplicity)
  coGeneric:TPersistentClass;
  coItem:TCoreObject;
begin
  for iLcv:=0 to High(CoreObjectItems) do begin
    ItemP:=CoreObjectItems[iLcv];
    coGeneric:=GetClass(ItemP^.ClassName);
    if (coGeneric<>nil) and coGeneric.InheritsFrom(TCoreObject) then begin
      coItem:=coGeneric as TCoreObject << COMPILER ERROR :-(
      TPersistentClass(coItem):=coGeneric; << Compiles but get Runtime Error
      coItem.VerifyIDs(Module); < CRASH @ RUNTIME
    end;
  end;
end;

How can I get each class's implement of VerifyIDs to get called as
each one is different but yet single.