Obsolete customer exit that can be associated with data elements in ABAP Dictionary in customer systems. If a dynpro field is defined with reference to a data element of this type, a function module called FIELD_EXIT_dtel is called in data transports from the dynpro to the ABAP program at PAI time. Here, dtel is the name of the data element. The value of the dynpro field can be modified in the function module. The function module of a field exit cannot currently be debugged.