DBA_ERRORS and error lines reported for TRIGGERS

As you probably know, the lines shown in views DBA_ERRORS/ALL_ERRORS/USER_ERRORS in the case of triggers are wrong.

But they are not totally wrong, they are just shifted by the amount of lines between the line containing the keyword TRIGGER and either DECLARE or BEGIN, whichever occurs first.

See the example below for an error reported by the dba_errors view on line 2 caused by missing grants on the table used in the variable declaration:

TRIGGER GAGREA2.TR_ASSEGNAZIONE_AI
   AFTER INSERT ON ASSEGNAZIONE
   REFERENCING OLD AS OLD NEW AS NEW
   FOR EACH ROW
DECLARE
   LI_ID_ASSEGNAZIONE_DOM_RICGEN             GAGREA2.DOMANDA_ASG_SPECIFICHE.ID_ASSEGNAZIONE_DOM_RICGEN%TYPE;
BEGIN

   GAGREA2.PKG_TRIGGER.SET_ID_ASSEGNAZIONE_DOM_RICGEN ( :NEW.ID_DOMANDA, LI_ID_ASSEGNAZIONE_DOM_RICGEN );

END TR_ASSEGNAZIONE_AI;

So, the real line number can be obtained adding the number of the line containing DECLARE (or BEGIN if DECLARE is missing) minus 1, that is 2 + 5 - 1 = 6.