Set value to variable into trigger

Hello all. I am Andrew.
I try to set value variable following code:
create or replace TRIGGER "ITOP".SERVER_TRG
BEFORE INSERT ON SERVER
FOR EACH ROW
BEGIN
SELECT SERVER_SEQ.NEXTVAL INTO :NEW.ID_SERVER FROM DUAL;
(:P4_ID_SERVER) := :NEW.ID_SERVER;
END;
But compile completes with error:
PLS-00049: bad bind variable 'P4_ID_SERVER'
Why ?
Please help me.
Andrew.

Replace
(:P4_ID_SERVER) := :NEW.ID_SERVER;
with
APEX_UTIL.SET_SESSION_STATE('P4_ID_SERVER' ,:NEW.ID_SERVER);

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