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Use this event to

...

Use this event to

Requires corresponding changes to Application.cfg to generate a Lookup-request including a new custom LookupType. 

If you are using MOB5.29 (or newer) consider using the OnLookupOnCustomLookupType event instead.
If you are using MOB5.21 (or newer) -MOB5.28 consider using the (Legacy) OnLookupOnCustomLookupType (MOB5.21 - MOB5.28) event instead.

Sample request

<request name="Lookup" created="2018-12-06T15:23:00+01:00" xmlns="http://schemas.microsoft.com/Dynamics/Mobile/2007/04/Documents/Request">
     <requestData name="Lookup">
          <ItemNumber>1980-s</ItemNumber>
          <LookupType>MyCustomSubstituteItems</LookupType>
    </requestData>
</request>

Template

    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Lookup", 'OnLookupOnCustomLookupTypeAsXml', '', true, true)]
    local procedure OnLookupOnCustomLookupTypeAsXml(var _XmlRequestDoc: XmlDocument; _LookupType: Text[50]; var _XmlResultDoc: XmlDocument; var _IsHandled: Boolean)
    begin
    end;

Example

    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Lookup", 'OnLookupOnCustomLookupTypeAsXml', '', true, true)]
    local procedure MyOnLookupOnCustomLookupTypeAsXml(var _XmlRequestDoc: XmlDocument; _LookupType: Text[50]; var _XmlResultDoc: XmlDocument; var _IsHandled: Boolean)
    begin
        if _LookupType = 'MyCustomSubstituteItems' then begin
            if _IsHandled then
                exit;

            MyCustomLookupSubstituteItems(_XmlRequestDoc, _XmlResultDoc);

            _IsHandled := true;
        end;
    end;

    local procedure MyCustomLookupSubstituteItems(_XmlRequestDoc: XmlDocument; var _XmlResultDoc: XmlDocument);
    var
        ItemSubstitution: Record "Item Substitution";
        TempLookupResponseElement: Record "MOB NS WhseInquery Element" temporary;
        MobWmsLookup: Codeunit "MOB WMS Lookup";
        MobToolbox: Codeunit "MOB Toolbox";
        MobWmsToolbox: Codeunit "MOB WMS Toolbox";
        MobXmlMgt: Codeunit "MOB Xml Management";
        XmlResponseData: XmlNode;
        XmlRequestNode: XmlNode;
        XmlRequestDataNode: XmlNode;
        XmlParameterNode: XmlNode;
        ItemNumber: Code[20];
        VariantCode: Code[10];
    begin
        // Extract any parameters from the XML
        // The parameters are located in the <requestData> element
        MobXmlMgt.GetDocRootNode(_XmlRequestDoc, XmlRequestNode);
        MobXmlMgt.FindNode(XmlRequestNode, 'requestData', XmlRequestDataNode);
        // -- Now find the location parameter
        MobXmlMgt.FindNode(XmlRequestDataNode, 'ItemNumber', XmlParameterNode);
        // -- Get the parameter
        ItemNumber := MobWmsToolbox.CheckCrossRef(CopyStr(MobToolbox.ReadEAN(MobXmlMgt.GetNodeInnerText(XmlParameterNode)), 1, 20), VariantCode);
        // Initialize the response xml
        MobToolbox.InitializeResponseDocWithNS(_XmlResultDoc, XmlResponseData, CopyStr(MobXmlMgt.NS_WHSEMODEL(), 1, 1024));
        // Determine if the item has substitutes
        ItemSubstitution.SetRange("No.", MobWmsToolbox.GetItemNumber(ItemNumber));
        ItemSubstitution.SetRange("Variant Code", VariantCode);
        if ItemSubstitution.FindSet() then
            repeat
                // Collect the buffer values for the <LookupResponse> element
                TempLookupResponseElement.Create();
                MyCustomSetFromLookupSubstituteItem(ItemSubstitution, TempLookupResponseElement);
                TempLookupResponseElement.Save();
            until ItemSubstitution.Next() = 0;
        MobWmsLookup.AddLookupResponseElements(XmlResponseData, TempLookupResponseElement);
    end;
    local procedure MyCustomSetFromLookupSubstituteItem(_ItemSubstitution: Record "Item Substitution"; var _LookupResponseElement: Record "MOB NS WhseInquery Element")
    var
        Item: Record Item;
        ItemVariant: Record "Item Variant";
        MobWmsLookup: Codeunit "MOB WMS Lookup";
        MobWmsLanguage: Codeunit "MOB WMS Language";
        MobWmsToolbox: Codeunit "MOB WMS Toolbox";
        LineBuf: array[10] of Text[250];
    begin
        Item.Get(_ItemSubstitution."Substitute No.");
        // Populate LineBuf[1] and LineBuf[2] from details about the substitute
        Clear(LineBuf);
        if (_ItemSubstitution."Substitute Variant Code" <> '') and (ItemVariant.Get(_ItemSubstitution."Substitute No.", _ItemSubstitution."Substitute Variant Code")) then
            MobWmsLookup.GetText(ItemVariant.Description, ItemVariant."Description 2", LineBuf)
        else
            MobWmsLookup.GetText(Item.Description, Item."Description 2", LineBuf);
        ";
        MobWmsToolbox: Codeunit "MOB WMS Toolbox";
        MobXmlMgt: Codeunit "MOB Xml Management";
        XmlResponseData: XmlNode;
        XmlRequestNode: XmlNode;
        XmlRequestDataNode: XmlNode;
        XmlParameterNode: XmlNode;
        ItemNumber: Code[20];
        VariantCode: Code[10];
    begin

        // Extract any parameters from the XML
        // The parameters are located in the <requestData> element
        MobXmlMgt.GetDocRootNode(_XmlRequestDoc, XmlRequestNode);
        MobXmlMgt.FindNode(XmlRequestNode, 'requestData', XmlRequestDataNode);

        // -- Now find the location parameter
        MobXmlMgt.FindNode(XmlRequestDataNode, 'ItemNumber', XmlParameterNode);
        // -- Get the parameter
        ItemNumber := MobWmsToolbox.CheckCrossRef(CopyStr(MobToolbox.ReadEAN(MobXmlMgt.GetNodeInnerText(XmlParameterNode)), 1, 20), VariantCode);

        // Initialize the response xml
        MobToolbox.InitializeResponseDocWithNS(_XmlResultDoc, XmlResponseData, CopyStr(MobXmlMgt.NS_WHSEMODEL(), 1, 1024));

        // Determine if the item has substitutes
        ItemSubstitution.SetRange("No.", MobWmsToolbox.GetItemNumber(ItemNumber));
        ItemSubstitution.SetRange("Variant Code", VariantCode);

        if ItemSubstitution.FindSet() then
            repeat
                // Collect the buffer values for the <LookupResponse> element
                TempLookupResponseElement.Create();
                MyCustomSetFromLookupSubstituteItem(ItemSubstitution, TempLookupResponseElement);
                TempLookupResponseElement.Save();

            until ItemSubstitution.Next() = 0;

        MobWmsLookup.AddLookupResponseElements(XmlResponseData, TempLookupResponseElement);
    end;

    localprocedure MyCustomSetFromLookupSubstituteItem(_ItemSubstitution: Record "Item Substitution"; var _LookupResponseElement: Record "MOB NS WhseInquery Element")
    var
        MobWmsLanguage: Codeunit "MOB WMS Language";
        MobWmsToolbox: Codeunit "MOB WMS Toolbox";
    begin
        _LookupResponseElement.Init();

                _LookupResponseElement.Set_Location('');
                _LookupResponseElement.Set_ItemNumber(_ItemSubstitution."Substitute NoSubstitute No.");
                _LookupResponseElement.Set_Barcode('');

                _LookupResponseElement.Set_SerialNumber('');
                _LookupResponseElement.Set_LotNumber('');
                _LookupResponseElement.Set_Bin('');
                _LookupResponseElement.Set_Quantity(1);
                _LookupResponseElement.Set_UoM('');
        
        _LookupResponseElement.SetValue('MyCustomValue',  'My Custom ValueMy Custom Value');

                _LookupResponseElement.Set_DisplayLine1(_LookupResponseElement.Get_ItemNumber());
                _LookupResponseElement.Set_DisplayLine2(LineBuf[1]MobWmsToolbox.GetItemDescription(_ItemSubstitution."Substitute No.", _ItemSubstitution."Substitute Variant Code"));
                _LookupResponseElement.Set_DisplayLine3(LineBuf[2]'');
                _LookupResponseElement.Set_DisplayLine4(_ItemSubstitution."Substitute Variant CodeSubstitute Variant Code"  <> <> '',  MobWmsLanguageMobWmsLanguage.GetMessage('VARIANT_LABEL')  +  '   '  +   _ItemSubstitution."Substitute Variant CodeSubstitute Variant Code",  '');
                _LookupResponseElement.Set_DisplayLine5('Interchangeable:   '  +  MobWmsToolboxMobWmsToolbox.Bool2TextAsDisplayFormat(_ItemSubstitution.Interchangeable));
        _LookupResponseElement.Set_ExtraInfo1('');
        _LookupResponseElement.Set_ExtraInfo2('');
        _LookupResponseElement.Set_ExtraInfo3('');
        end;

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