DOC Level percent and baseamount

XML and business rules
1

Hi team I have 2 queries

  1. can multipler factor numeric and baseamount be added at document level allowance
  2. an invoice with multiple line items with different tax categories can have document level DISC1 DISC2 or all the line items and DOC level DISC1 DISC2 categories should always be the same
    3 if invoice with different categories at line level can have the INV DOC level DISC1 DISC2 then what should be the baseamount to be displayed at DOC level allowance block ( if it is allowed)