Autorization object for field AUSVN, tcode IW22

Hi,

My requirement is to authorize users to chance filed Malfunct. start (AUSVN) while using transaction IW22. Is it possible to create a custom Authorization Object and assign it custom roles. At the time of document saving user exit QQMA0014 will be called here can we do

AUTHORITY-CHECK OBJECT 'ZI*****'

          ID 'ACTVT' FIELD '02'

          ID 'AUSVN' FIELD i_viqmel-ausvn.

Please suggest.

Best Regards,

Nilesh