I want to ask that in the picture below, there is a field ("Document No.") whose datatype is Code[20] but still the field is auto-incremented whenever a new line is created. Like in the above picture, for the first line "Document No." was G0003 and automatically when I initialized the new line the "Document No." becomes G0004. How can a Code datatype be auto-incremented? And how can I do that when I have to enter it by passing some action?