Триггер блокировки периода (старая версия)

CREATE TRIGGER ac_bi_entry_block FOR ac_entry
  INACTIVE
  BEFORE INSERT
  POSITION 28017
AS
  DECLARE VARIABLE IG INTEGER;
  DECLARE VARIABLE BG INTEGER;
  DECLARE VARIABLE DT INTEGER;
  DECLARE VARIABLE F INTEGER;
BEGIN
  IF ((NEW.entrydate - CAST('17.11.1858' AS DATE)) < GEN_ID(gd_g_block, 0)) THEN
  BEGIN
    SELECT d.documenttypekey
    FROM gd_document d
      JOIN ac_record r ON r.documentkey = d.id
    WHERE
      r.id = NEW.recordkey
    INTO
      :DT;

    EXECUTE PROCEDURE gd_p_exclude_block_dt (:DT)
      RETURNING_VALUES :F;

    IF(:F = 0) THEN
    BEGIN
      BG = GEN_ID(gd_g_block_group, 0);
      IF (:BG = 0) THEN
      BEGIN
        EXCEPTION gd_e_block;
      END ELSE
      BEGIN
        SELECT ingroup FROM gd_user WHERE ibname = CURRENT_USER
          INTO :IG;
        IF (BIN_AND(:BG, :IG) = 0) THEN
        BEGIN
          EXCEPTION gd_e_block;
        END
      END
    END  
  END
END