NOT_AVAILABLE_ON is an optional field which identifies a day the worker is not available to work on.
X_DAY_OF_WEEK is a fixed lexicon with the following values:
| Saved Value | Displayed Value |
|---|---|
| 01 | Sunday |
| 02 | Monday |
| 03 | Tuesday |
| 04 | Wednesday |
| 05 | Thursday |
| 06 | Friday |
| 07 | Saturday |
| 08 | Weekdays |
| 09 | Weekends |
| 10 | Week Start Day |
