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With Grouping order linesOrder Lines functionality you can condense order lines lists at the mobile device, when multiple lines from the same order lines list shares enough characteristics to make it reasonable to combine (group) them.
Any response returning 'BaseOrderLineElement's (see eventdescriptions) can be customized to group matching order lines.

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To group a number of lines, two events is needed to get the group working: One event to define how lines are grouped (mandatory) and one event to handle how each group is displayed at the mobile device (optional).

• 'OnGetXXXOrderLines_OnAfterSetFromXXX' : Use any SetFrom-event from (planned) Wms Document Handlers to define how lines are grouped
• 'OnAfterGroupByBaseOrderLineElements' : Triggered once per group. Here you can optionally change how the "grouped" element is displayed at the mobile device
  
  
• (Also, changes are needed to application.cfg to enable the group/ungroup functionatlity see below)

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    // Putaway: Decide which elements can be grouped (SN specific tracking)
    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Put Away", 'OnGetPutAwayOrderLines_OnAfterSetFromWarehouseActivityLine', '', true, true)]
    local procedure OnGetPutAwayOrderLines_OnAfterSetFromWarehouseActivityLine(_WhseActLineTake: Record "Warehouse Activity Line"; var _BaseOrderLineElement: Record "MOB NS BaseDataModel Element")
    var
        Item: Record Item;
        ItemTrackingCode: Record "Item Tracking Code";
    begin
        Item.Get(_WhseActLineTake."Item No.");
        if (ItemTrackingCode.Get(Item."Item Tracking Code") and ItemTrackingCode."SN Specific Tracking") then begin
            // Group SN Specific Tracked items
            _BaseOrderLineElement.SetGroupBy('ItemNumber,UnitOfMeasure,FromBin,ToBin');
            _BaseOrderLineElement.SetValue('MyGroupName', 'PutAway.GroupBySerialNumber');  // Some unique identifier for this GroupBy condition to look for in OnAfterGroupBy-event
        end;
    end;

    // Putaway: Handle appearance of "grouped" element to be displayed at mobile device
    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Base Document Handler", 'OnAfterGroupByBaseOrderLineElements', '', true, true)]
    local procedure OnAfterGroupByBaseOrderLineElements(var _GroupOrderLineElement: Record "MOB Ns BaseDataModel Element"; var _IsGrouped: Boolean; var _BaseOrderLineElements: Record "MOB Ns BaseDataModel Element"; var _IsHandled: Boolean)
    begin
        if (_GroupOrderLineElement.GetValue('MyGroupName') = 'PutAway.GroupBySerialNumber') then begin
            _IsGrouped := _BaseOrderLineElements.Count() > 1;   // Suppress grouping if this group includes only a single element
            _GroupOrderLineElement.Set_DisplayLine4(StrSubstNo('Serial No.: Yes'));     // Only used if the elements is actually grouped

            // Optional: Since these elements can be grouped/ungrouped on the fly at the mobile device, add some text to indicate this
            if _IsGrouped then begin
                _BaseOrderLineElements.FindSet();
                repeat
                    _BaseOrderLineElements.Set_DisplayLine4(_BaseOrderLineElements.Get_DisplayLine4() + '  (can be grouped)');
                until _BaseOrderLineElements.Next() = 0;
            end;
            _IsHandled := true;
        end;
    end;

Step 2: Enable in Mobile config

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This Grouping order linesOrder Lines knowledgebase article explains what is happening "behind the scenes", including how registered quantities are distributed among grouped lines.
The changes to the Xml response format for grouped elements (as explained in that article) are handled implicitely by the _BaseOrderLineElement.SetGroupBy()-method, as in the example above.

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