It would be useful to be able to add an interface to a record. This would enable to reduce a lot of the code to write. For example a headerlLine construct always contain a lot of duplication. There could be an Codeunit that is able to do certain things with any record that implements the Header Line interfaces.

In general it would be good to be able to define fields that are required but for a first version just make sure procedures exists would be sufficient. So instead of requiring the field "Line No." It would be good enough to require the methods GetLine and SetLine.