Data type for automatically incrementing value in field

[SPots]

We are currently using SugarCRM 4.5.1d
I would like to add a field in a module which autmotically increments based on the latest saved value (in fact, similar to a ticket number which increments automatically in a Help Desk tool).
I could not find any data type that provides this functionality.
Does anybody know how ?

Thanks.

Stef

[Superman]

there is a key 'auto_increment' => true in vardefs file. But, this will not work if you wouldnt set this field as primary key.

if you are not going to use the field as a primary key, then you have to use tricks like setting new value through logic hooks 'before_save', for example.