When a user starts to enter data in a field where the choices are constrained to existing data (for example, an Item No., a Salesperson Code, a Unit of Measure code, a Customer No., and so on), good design dictates that the system will help the user by displaying the universe of acceptable choices. Put simply, a lookup list of choices should be displayed.
In the Role Tailored Client (RTC), the lookup display (a drop-down control) is generated dynamically when its display is requested by the user's effort to enter data in a field that references a table through the TableRelation property (which will be discussed in more detail in the next chapter). The format of the drop-down control is a basic list. The fields that are included in that list and their left to right display sequence are either defined by default or by an entry in the FieldGroups table.
The fieldgroups table is part of the Business Central table definition, much like the list of keys. In fact, the ...