Hi,

if the field 'state' is of the type 'Selection', you would hardly achieve the goal in a simple manner.

The point is that 'Selection' represents char (string) in the database, so ordering means alphabetical order. In such a case the easiest way, is to rename the states (e.g. to have a number at the beginning).

Otherwise, make the state of the many2one type with a reference to another model (have a look how it is done in crm.lead & crm.stage). In such a case you would be able to select the param _order of that related model (e.g. sequence in the case of crm.lead)