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From: L Dries <bertus.dries@planet.nl>
Subject: raised CONSTRAINT_ERROR : sudoku_choose_chr_cb.adb:57 access check
 failed
Date: Wed, 22 Jan 2020 07:58:13 +0100
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Date: 2020-01-22T07:58:13+01:00
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The line (57):
Append_Text(Choose_Chr_Dialog.Str_Combo_Choose_Char, 
To_String(symbols(n, 2)));

gives:

raised CONSTRAINT_ERROR : sudoku_choose_chr_cb.adb:57 access check failed

the value of n = 1 declaration of symbols(0 .. 36, 1 ..3) array of 
unboumded_string

output of symbols(n, 2) as well as To_String(symbols(n, 2)) results in A 
which is the value present in  symbols(n,2)

In other parts of the program this statement does not present problems

The statement is used in then On_OK routine of another Dialog. Of that 
Dialog the is Ended before Appen_Text is called
-- 
L. Dries