Is it possible not to permit database action ( like deleting,
updating) based on SP result w/o exception message ? For example ,
I would like to stop deleting a record if stored procedure
called by trigger "before delete" returns me "False" , and I don't
want to see any messages !!! .

Don't be focused on deleting , because based on this I would like to
implement that based on one field value I can stop someone to change
another field.

Thanx

Goran