Triggering benefit life events with assignment attribute changes

Summary:

Triggering a life event in Oracle Benefits based on a change to a custom attribute defined on the assignment page is needed. A fast formula has been configured, but the life event is not being triggered. Has anyone encountered this and found a solution?

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Code Snippet (add any code snippets that support your topic, if applicable):

default for BEN_PER_ASG_IN_ATTRIBUTE3 is 'XX'
default for BEN_PER_ASG_OUT_ATTRIBUTE3 is 'XX'

inputs are BEN_PER_ASG_IN_ATTRIBUTE3