The formula is:
If (IsBlank (Ddl_Gem) Or (IsBlank (Ddl_1) Or IsBlank (Txt_S1)), false, true, Navigate (Scr_InsertUpdate, Fade));
Notification ("Fill in the field", NotificationType.Error);
ResetForm (Form4)
But if the fields are filled in, the error is still displayed.
Please I need your help