Where is my ASIS mistake?

[Xela <xela2@free.fr>]

With a basic ASIS program I am attempting to list all units in my current 
library.
In order, I wrote the following code:
------------
with Asis;
with Asis.Implementation;
with Asis.Ada_Environments;
with Asis.Compilation_Units;
with Asis.Ada_Environments.Containers;
with Ada.Text_Io;
with Ada.Wide_Text_Io;
procedure List_Units is
    My_Context  : Asis.Context;
    Sep : constant String := "------------------------------------------";
begin
    Asis.Implementation.Initialize;
    Asis.Ada_Environments.Associate(My_Context, "My Context");
    Asis.Ada_Environments.Open (My_Context);
    declare
        Libraries_List : Asis.Ada_Environments.Containers.Container_List
            := Asis.Ada_Environments.Containers.Defining_Containers(My_Context);
        Units_List :  Asis.Compilation_Unit_List
            := Asis.Ada_Environments.Containers.Compilation_Units(
            Libraries_List(1));
    begin
        for U in  Units_List'range loop
            Ada.Text_Io.Put_Line(Sep);
            Ada.Wide_Text_Io.Put_Line("Full Name = "&Asis.Compilation_Units.
Unit_Full_Name(Units_List(U)));
            Ada.Wide_Text_Io.Put_Line("Texte Name= "&Asis.Compilation_Units.
Text_Name(Units_List(U)));
            Ada.Text_Io.Put_Line("Unit Kind = "&Asis.Unit_Kinds'Image(Asis.
Compilation_Units.Unit_Kind(Units_List(U))));
        end loop;
    end;
    Ada.Text_Io.Put_Line(Sep);
    Asis.Ada_Environments.Close( My_Context );
    Asis.Ada_Environments.Dissociate( My_Context );
    Asis.Implementation.Finalize;
end List_Units;
--------

If now I compile with gnat3.15p  the following code (gnatmake hello), and also 
my List_units one :

with Ada.Text_Io;
procedure Hello is
begin
   Ada.Text_Io.Put_Line("hello!");
end Hello;

Executing list_units.exe give me:

--------------------------------------
Full Name = Standard
Texte Name= 
Unit Kind = A_PACKAGE
-------------------------------------- :-(

Now with the same code, If I recompile my list_units program and I execute it 
under an ObjectAda library registered with the hello unit the result is the 
expecting one:

------------------------------------------
Full Name = Hello
Texte Name= d:\Cholay\Tmp\Exercices\hello.adb
Unit Kind = A_PROCEDURE_BODY
------------------------------------------ :-)

I am convincing with the fact that I am making a huge error but which one?
Thanks for the help!




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