If the DITA tools you use cannot accommodate relationship tables that include the extra ALink column, you can instruct DITA2Go to omit that column.
To prevent DITA2Go from including an ALink column in relationship tables:
[DITAOptions] ; UseRelNameColumn = Yes (default, first col of reltable has ALink ; name in <data> element) or No (use only usual type columns). UseRelNameColumn = No
If your document does not include ALink references, and you do not insert any DITARelRow PI marker (see §25.1.4.3 Adding ALink rows to relationship tables), DITA2Go does not produce a relationship table for the map.