Form 重置记录编号（app_record.for_all_record）

A block lines has item line_number. When a record is deleted,
line_number must be renumbered.
step 1：
Create your item handler procedures as follows:
PACKAGE BODY lines IS
line_number_seq number := 0;
PROCEDURE delete_row IS
BEGIN
line_number_seq := 0;
APP_RECORD.FOR_ALL_RECORDS(‘reseq_line_number’);
END delete_row;
END lines;
step 2：
Create a user–defined trigger RESEQ_LINE_NUMBER as follows:
lines.line_number_seq := lines.line_number_seq + 1;
:lines.line_number := lines.line_number_seq;
step 3：
Call your item handler procedures in:
Trigger: KEY–DELETE:
lines.line_number(’KEY–DELETE’);

以上是标准文档的东西，但是错就在第三步，正确的是：
Trigger:  KEY-DELREC :
delete_record;
lines.delete_row;