Cannot add dynamic flex fields to entity

When you use custom fdynamic lex fields for bookings, N4 sometimes displays an error message when you enter data in those fields in the Booking forms.

When creating the dynamic flex fields, you may have used customFlexFields. Instead, you must use the bookCustomFlexFields for the booking entity. For example, if you are customizing the ORD001 form and want to add the Rail Exempt check box in Edit Booking form, use the following flex field:

<column fieldId="bookCustomFlexFields.bkgCustomDFFRailExempt" />