System allows Absence Type Entry without existing Plan

Summary:

We have two absence types behaving differently with respect to absence recoding error messages even though the configurations look the same

Content (please ensure you mask any confidential information):

All:

I am very new to Oracle Fusion having gone live just this new year. I am trying to slowly learn as well as understand. The consultants had configured the absence plans and absence types. After go-live we find one of those absence types cannot be submitted if the worker does not have the plan. We get the error "You can't record this absence because the employee isn't enrolled in or eligible for any absence plan. (ANC-3405033)