Getting an error when using array type variable only begin with HWM_EXT DBI's

We need to gather work schedule and / or workday patterns values in Absence Type Duration fast formula. The array type DBI items somehow do not work and give error: HWM_EXT_WORK_SCHEDULE_PATTERN_PATTERN_NAME, HWM_EXT_WORK_SCHEDULE_NAME

1- The formula is compiled successfully initially. Status: "Compiled"

2- Then the absence record is entered in UI, it gives error as: absence day must be a scheduled day.

3- Then we go to fast formula page and see that it gave the below error and the compile status changes as: "Invalid"

4- Error Message Formula TEST1 TAV GEO CONVERSION compilation failed while creating the formula PL/SQL package FFP300000438444215_01012020.