[Vtigercrm-developers] Information about vtiger_fields and warnings after dropping some rows.

[Christian Castelli]

Hi vTiger developers,
my company sells web services, so there are a lot of field in many 
modules (such as Leads, Quotes, Accounts and Invoice) that we don't need 
(and won't need).
Instead of modifying Smarty templates (which would have taken too much 
time), I considered to delete these fields directly in the DB, from 
vtiger_fields.
It seems to work all fine but:

1) I've noticed that every time I deleted some rows from vtiger_field, 
the system log me out. Then I logged in again and when I deleted some 
rows it logged me out again. Is it normal?

2) After these mods, I receive these warning (these printings come from 
Xdebug) only in Home Page and Invoice Module ListView.

Warning: Invalid argument supplied for foreach() in 
/var/www/work/vtiger/include/utils/ListViewUtils.php on line 1169
Call Stack
#    Time    Memory    Function    Location
1    0.0031    253276    {main}( )    ../index.php:0
2    0.8356    13673132    include( 
'/var/www/work/vtiger/modules/Home/index.php' )    ../index.php:577
3    1.8453    15020680    getTopInvoice( )    ../index.php:135
4    1.9300    15163560    getListViewEntries( )   
 ../ListTopInvoice.php:115
5    1.9666    15196216    getValue( )    ../ListViewUtils.php:889

Have I missed something? It's not so important to correct these warnings 
but if I can, I'll do.
Thanks for attention,
Greetings.