Domain IDO
If the property is a foreign key, specify the domain IDO of the property; that is, the other IDO where the property is defined.
Note: If you select a domain IDO here for a bound component,
and if there are no validators defined for that component, the system performs an automatic
foreign key validation for that component and value during a save operation. That means
that, if a user enters a value and then attempts to save it, the system does a check to see
if the value that was entered is valid. If not—that is, if the entered value does not exist
in the list of values returned by a query of the specified domain IDO and property—the
system presents a validation error message to the user and aborts the save operation.