Oracle 9i Object Type ..using self

I have created and object with
several attributes of standard oracle datatypes. I have one that is of a custom object type. this object provides encapsulated functionality. I instansiate the internal custom object using a constructor function. the constructor includes the creation of a primary key. once the constructor is done, the object is initialized( an internal flag is set, which should only be done once)
To use this custom object in a member method, I have to do something like this..
( i have summarized code for brevity)
MEMBER FUNCTION foo( ) return obj
is
l_self PARENT_OBJ_TYPE:= SELF;
local INTERNAL_OBJ :=SELF.internal_obj;
begin
local.method1() -- insert record( flag is true)
local.method1() --insert another record( but this time the flag that was set upon construction is now set to FALSE..
I get an error.)
end;
I do not do anything tricky. the behavior seems to be that object types do not keep state appropriately.
any ideas of why this could be happening?

there was no real error code just unexpected behavior. it did not crash. I figured it out. it had to do with passing self as a parameter in out so that it keeps state

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