This entry point can also be called from other processes, such as the LETTSUB process, by using the following code:
Gosub FILTRE_SPE From LETTRAGE
There is no transaction in progress.
There is an open log file.
LETTRAGE processing: the LETTRAGE [LTR] screen is on line and contains the launch parameters selected by the user.
LETTSUB processing: the LETTAUTO [LTA] and LETTCRIT [DIA] screens are on line and contain the launch parameters selected by the user.