This behavior is caused by the date field in question being set to allow users to select a date from a pre-defined list of index values. The pre-defined index list option overrides the “Display Calendar” feature.

If it is not desired to use a pre-defined list, it can be disabled in the project settings to allow the calendar to display.

An administrator will need to perform the following steps:

1. Edit the project properties.
2. Select the date field in question and click the Edit button.
3. In the “Index Field Value List” section, change the radio button to the option “Users enter ad hoc Index Field Values.”
4. Click the OK button to save the index field, and then save the project properties.
5. Log out of the client, or refresh the client interface.

The project’s date field will now display the calendar control when adding or modifying the index value.