[otrs] New field on Customer Interface.

Hi All, We need to add a new field in the customer interface to receive and store a number of control that the customer has in their system. This number must be associated with the new otrs ticket. This new field must be entered by the customer through the screen: customer.pl?Action=CustomerTicketMessage And can be changed through the screen: customer.pl?Action=CustomerTicketZoom&TicketID At database level, we guess we can use the field ticket.FREETEXT1, but we are not sure. Is there any way to implement it? If Yes, What is the best way? We are using otrs 2.4.3 with ITSM 1.3.1 on Oracle Database. Thanks. Best Regards. Gediel Luchetta.