Is it possible to use constants in when condition of a trigger

I need to check for a condition (say user = ‘XYZ’). Since this value XYZ has not yet been finalized, I would like to assign this value to a constant and use it in the trigger. Hence any change would require me to only change the value assigned to the constant. This condition will be used in many triggers.
So the when condition would be
CREATE OR REPLACE TRIGGER SOLI_ARI
AFTER INSERT ON SO_TABLE
REFERENCING NEW AS newRow
FOR EACH ROW
when (user = PackageA.constant_xyz)
When I do this, I get the following error:
invalid NEW or OLD specification.
Please help me. Is there any other alternative?

No, you can't do this in the WHEN clause (see the third restriction here).
Instead do it in the body of the trigger.
btw is "newRow" really much clearer than the default "new"?

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Is it possible to use constants in when condition of a trigger

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