sales_order => [ "SL::DB::Order", [ sales => 1, quotation => 0 ] ],
sales_quotation => [ "SL::DB::Order", [ sales => 1, quotation => 1 ] ],
purchase_order => [ "SL::DB::Order", [ sales => 0, quotation => 1 ] ],
sales_order => [ "SL::DB::Order", [ sales => 1, quotation => 0 ] ],
sales_quotation => [ "SL::DB::Order", [ sales => 1, quotation => 1 ] ],
purchase_order => [ "SL::DB::Order", [ sales => 0, quotation => 1 ] ],