When Allow Per Line Department and Allow Per Line Class enabled: Updates made on the Department, Class and Location on the header line are also reflected on the line items DCL.

When Allow Per Line Department and Allow Per Line Class preferences are enabled: Updates made on the Department, Class and Location on the header line are also reflected on the line items Department, Class and Location

1.  This happens when the  Department, Class and Location fields are hidden on the transaction form.  It is as if the preferences are turned off.
2.  If the Department, Class and Location fields are exposed, changing the header Department, Class and Location will not update the line items Department, Class and Location.