Hello Flavio,
You can simply create a class TMovimentDetail with an association to TMovimentMaster:
TMovimentDetail = class
FMaster: TMovimentMaster;
then do a search on MovimentDetail using your criteria:
Details := Manager.Find<TMovimentDetail>.
Where(Linq[‘descrizione’] = ‘TEST’ or Linq[‘descrizione’].IsNull)
Then you can get the master using the association:
for Detail in Details do
Detail.Master // use master here