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   A Invoice-like data entry system is used to manage data entry activity
   on two files linked with a 1:N relation, and is made up of two key parts:
   Header and Rows (detail).

   This type of management consists of a single Form object on which the List
   Box control is present. The Form object contains the data relative to the
   single record of the parent file (the header of the invoice), while the
   List Box control displays the data coming from the associated N records of
   the child file (detail rows of the invoice).

   The definition of a Invoice-like data entry requires that between the
   parent and the child file, a 1:N relation exists.

   A second object of type Edit Browse, not resident on screen, allows to
   enter or modify the data displayed in the List Box.

   A Invoice-like data entry system allows you to take advantage of all the
   automatisms associated to the 1:N relations (see chapter "Definition of
   the data").