Diagnosis
You tried to go to the screen for defining the output options for thefields but did not specify which fields should be output in the basiclist.

Procedure
In the 'Basic List Line Structure' screen, define which fields shouldbe output in the basic list.
A field is output in the basic list if it is either assigned to a line(fill in columns 'Line' and 'Sequence') or if this field is used foradding (select column 'Sum').