a, i c, so combination of 2 fields : field amcno & field unitid that you 
want to ensure that is unique, 
hm, perhaps you can create new field to store combination of those field 
and use before insert call back or form validation to assign that 
combination field into 1 new field and put unique = True or requires = 
IS_NOT_IN_DB()

best regards,
stifan

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