have you also altered $g_status_enum_string

What is $g_bug_assigned_status set to? It is probably set to ASSIGNED, which at this stage is set to 50.

The idea is to define new constants in custom_constant_inc.php. I would introduce MYASSIGNED status and use it instead of ASSIGNED.

Thank you very much for your help:

exk72,
I defined :
$s_status_enum_string = '10:new,20:acknowledged,30:assigned,40:in progress,50:to test,60:returned,80:resolved,90:closed';

vboctor,
And I did not change the $g_bug_assigned_status in the config_inc. It is still:

Status to assign to the bug when assigned.

$g_bug_assigned_status = ASSIGNED;

But I can not understand that I have defined "ASSIGNED" as 30 in the custome_constant_inc.php. Why $g_bu_assigned_status is set to 50 instead of 30 at this stage?

Currently, I have to set it to be 30 instead of "ASSIGNED" in the config_inc.php. I know it is kind of stupid. But I really want to use "ASSIGNED", Do you think there will be any potential trouble?
$g_bug_assigned_status = 30;

By the way, it may be helpful to post my customization here. Do you think there will be big problems with my customization? Thanks a lot.

config_inc.php:

20:acknowledged,30:assigned,40:in_progress,50:to_test,60:returned,80:resolved,90:closed

$g_status_enum_workflow[NEW_] = '20:acknowledged,30:assigned,40:in_progress,50:to_test,80:resolved';
$g_status_enum_workflow[ACKNOWLEDGED] = '30:assigned,40:in_progress,50:to_test';
$g_status_enum_workflow[ASSIGNED] = '40:in_progress,50:to_test';
$g_status_enum_workflow[IN_PROGRESS] =  '30:assigned,50:to_test';
$g_status_enum_workflow[TO_TEST] = '60:returned,80:resolved';
$g_status_enum_workflow[RETURNED] = '40:in_progress,50:to_test';
$g_status_enum_workflow[RESOLVED] = '60:returned,90:closed';
$g_status_enum_workflow[CLOSED] = '60:returned';

$g_status_colors['new'] = '#ffd850'; # orange
$g_status_colors['acknowledged'] = '#ffffb0'; # yellow
$g_status_colors['assigned'] = '#c8c8ff'; # blue
$g_status_colors['in progress'] = '#c8c8ff'; # blue
$g_status_colors['to test'] = '#ffa0a0'; # red
$g_status_colors['returned'] = '#7a7aff'; # dark blue

$g_access_levels_enum_string = '10:viewer,25:reporter,40:updater,50:vendor,55:developer,70:manager,90:administrator';

$g_access_levels_enum_string = '10:viewer,25:user,40:model office,50:vendor,55:developer,70:manager,90:administrator';

$g_status_enum_string   = '10:new,20:acknowledged,30:assigned,40:in progress,50:to test,60:returned,80:resolved,90:closed';
$g_bug_assigned_status = 30;

custom_strings_inc.php:

$s_access_levels_enum_string = '10:viewer,25:reporter,40:updater,50:vendor,55:developer,70:manager,90:administrator';

$s_access_levels_enum_string = '10:viewer,25:user,40:model office,50:vendor,55:developer,70:manager,90:administrator';

$s_status_enum_string   = '10:new,20:acknowledged,30:assigned,40:in progress,50:to test,60:returned,80:resolved,90:closed';

$s_in_progress_bug_title = 'Set Issue As In Progress';
$s_in_progress_bug_button = 'Set As In Progress';
$s_to_test_bug_title = 'Set Issue To Test';
$s_to_test_bug_button = 'Set To Test';
$s_returned_bug_title = 'Return Issue';
$s_returned_bug_button = 'Return Issue';

custom_constant_inc.php:

# access levels
define( 'USER',         25 );
define( 'MODEL_OFFICE',         40 );
define( 'VENDOR',           50 );

# status
define( 'ACKNOWLEDGED',         20 );
define( 'ASSIGNED',     30 );
define( 'IN_PROGRESS',          40 );
define( 'TO_TEST',      50 );
define( 'RETURNED',     60 );
define( 'RESOLVED',         80 );
define( 'CLOSED',           90 );

Over 5 years later ;-)

The problem is due to your trying to redefine an existing constant ASSIGNED (=50 in constant_inc.php).