FF is not working for Checklist Template

Hi,

I have created a journey, where below Fast Formula Is attached to Eligibility profile which Is in turn linked with Checklist Template.

Ask : Checklist should be triggered to all Employees & CWKs except for Trainees

Issue : Even Trainee's checklist are getting generated

Fast Formula :

DEFAULT FOR PER_ASG_ATTRIBUTE1 IS ' '

IF (PER_ASG_ATTRIBUTE1 = 'Trainee')

THEN(ELIGIBLE = 'N')

ELSE

(ELIGIBLE = 'Y')

RETURN ELIGIBLE