[firebird-support] Problem with a trigger

['Walter R. Ojeda Valiente' sistemas2000profesio...@gmail.com [firebird-support]]

Hello everybody

In a before insert or update trigger I have the following cases:

*Case 1:*
   IF (NEW.MVC_TIPMOV = 'SVT' AND INSERTING AND NEW.MVC_NRODOC = '1') THEN
BEGIN
   END

*Case 2:*
   IF (NEW.MVC_TIPMOV = 'SVT' AND INSERTING OR UPDATING AND NEW.MVC_NRODOC
= '1') THEN BEGIN
   END

*Case 3:*
   IF (NEW.MVC_TIPMOV = 'SVT' AND (INSERTING OR (UPDATING AND
NEW.MVC_NRODOC = '1'))) THEN BEGIN
   END

No problem with Case 1 and with Case 2, they both compiles well. However
Case 3 doesn't compile. Why?

Why it is not possible to use parentesis?

Firebird 2.5.2, SuperServer

Greetings.

Walter.