Im using decimal field and choose locale is Vietnamese, choose "Limit leading digits = 13 and Limit trailing degits = 0" but when i preview and enter data "1234567," (comma at end) then it change to 0.
I don't know anything about the Vietnamese number system, but I think it is because you are typing the comma. Is the comma the same as the decimal component in North American numbering systems? I am guess the decimal is probably an auto entry. You might want to play around with the "Patterns" to get the format that you are looking for. As a note, your screenshot shows that your Max trailing digits is 2 not 0.