Custom Data tab
This tab contains custom, user-defined fields that your Alloy Navigator Express administrator has configured in addition to the standard built-in object's fields. The default name of this tab is Custom Data, although the administrator may have renamed it.
User-defined fields can be of different types — text, logical, currency, etc. Some of them could be mandatory or read-only. If there are any mandatory fields on this tab, you must complete them to be able to save the changes.
NOTE: User-defined fields can also appear on the General tab of the object form, in a special section.