Currently if we try to export to Excel via data entity that has more than 255 fields in the mapping, DIXF throws the error "Export to Excel does not support more than 255 columns".
For example CustCustomerV3Entity has number of fields close to this limit and extensions to the data entity increase number of fields over the limit.
Increasing this limit will help to avoid additional steps required to work with such data entities (like modifying the default mapping by reducing the number of fields)