While creating a descendant of TDADataTableRules I noticed a (possible) bug in the code.
Line 6120
function TDADataTableRules.GetDetails(Index: integer): TDADataTable;
begin
result := TDADataTable(fDetails[Index])
end;
I think that converting a string (fDetails is a TStringList) into a TDADataTable needs a bit more magic 
My guess is that result = TDADataTable(fDetails.Objects[Index]) would give a better result.
Regards,
Filip.
Using Delphi 10.2.2 - RODA 9.6.112