Difference between authoring and redlining in preference and what difference it makes when Change Order is added to it
If you use the Import wizard in Redlining mode (the default setting), you must specify a change order to import items, BOMs, AMLs, and prices. Redlining mode,
If you use the Import wizard in Authoring mode, you can update an existing BOM, AML, or Published Price Lines if the parent item or price is unreleased and does not have a pending change
Refer to import/export guide
Regards
Srini
