The AFTER triggers are to late for creating unique keys for multiple records because the constraints are processed before they are fired. You can submit some fake but unique values for the column in question in the INSERT command. They will be replaced anyway.

>Yes, this field is not used as my primary key (I always use IDENTITY surragate key) but is setup with unique constraint index. I'm not asking for a better way to setup the fields in the table (the requirement is what it is) but rather a solution to a specific problem I'm having with updating the value in this field inside a trigger when more than one record is inserted via a query. Thanks Sergey.