powerdesigner生成的触发器 错误 求解

create or replace trigger "CompoundDeleteTrigger_discuss"
for delete on DISCUSS compound trigger
// Declaration
// Body
before statement is
begin
NULL;
end before statement;

before each row is
begin
NULL;
end before each row;

after each row is
begin
NULL;
end after each row;

after statement is
begin
NULL;
end after statement;

END
以上为生成的触发器代码,然后以下是编译调试报错:
错误(10,1): PLS-00103: 出现符号 "/"在需要下列之一时: function pragma procedure subtype type current cursor delete exists prior before after instead

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