Error when creating an Absence for an employee when using API

Hi,

We have a custom package that consolidates retro changes made on an employees element entries. In this package, we are planning to add hr_person_absence_api.create_person_absence to create absences for an employee and place it on the retro week. I ran the package and the absences were not created. Also, error message "ORA-20001: HR_289300_ABS_DYS_DISALLOWED:" is encountered. Can someone tell me what the error means and why it is encountered? below is how we used the API:

               hr_person_absence_api.create_person_absence
                  (p_validate                                => FALSE
                  ,p_effective_date                       => r_batches.effective_date