The possibility to select multiple values in a 'DVelop Combo', and manage the data (save serialized, deserialize to display, etc.) in a LongVarChar attribute was added.
Example: Select the amenities of a Property (Real State)
The Transaction 'Property' has an Attribute 'PropertyAmenities' that is LongVarChar:
Then, in the Transaction instance, you need to configure the Control Type and other properties of 'PropertyAmenities':
Finally, at runtime you will visualize it like follows: