Display method on InventOnHandItem form in ax2012

Adding two new fields on the InventOnHandItem form :

1. Add two controls in the grid dimension and supplier.
2. On the InventSum datasource add 2 new display methods to display data in these fields on the form.

Display method for dimension :

Display public AttributeValueText displayDimension(Inventsum _inventSum)
{
    PdmProduct              pdmProduct;
    PdmProductItem          pdmProductItem;
    PdmProductItemAttribute pdmProductItemAttribute;
    EcoResProduct           ecoResProduct;
    AttributeValueText      returnValue;
    EcoResValue             ecoResValue;
    EcoResAttribute         ecoResAttribute;

    ecoResProduct   = EcoResProduct::findByDisplayProductNumber(_inventSum.ItemId);

    select Attribute,Value from pdmProductItemAttribute
    join pdmProductItem
    where pdmProductItem.RecId     == PdmProductItemAttribute.ProductItem
    join pdmProduct
    where pdmProduct.RecId         == pdmProductItem.ProductRecId
       && pdmProduct.EcoResProduct == ecoResProduct.RecId
    join ecoResAttribute
    where ecoResAttribute.RecId    == pdmProductItemAttribute.Attribute
       && ecoResAttribute.Name     == "Dimension";
    {
        ecoResValue = EcoResValue::find(pdmProductItemAttribute.Value);
        returnValue = ecoResValue.value();
    }

    return returnValue;
}

Display method for Supplier :

Display public AttributeValueText displaySupplier(Inventsum _inventSum)
{
    PdmProduct              pdmProduct;
    PdmProductItem          pdmProductItem;
    PdmProductItemAttribute pdmProductItemAttribute;
    EcoResProduct           ecoResProduct;
    AttributeValueText      returnValue;
    EcoResValue             ecoResValue;
    EcoResAttribute         ecoResAttribute;

    ecoResProduct   = EcoResProduct::findByDisplayProductNumber(_inventSum.ItemId);

    select Attribute,Value from pdmProductItemAttribute
    join pdmProductItem
    where pdmProductItem.RecId     == PdmProductItemAttribute.ProductItem
    join pdmProduct
    where pdmProduct.RecId         == pdmProductItem.ProductRecId
       && pdmProduct.EcoResProduct == ecoResProduct.RecId
    join ecoResAttribute
    where ecoResAttribute.RecId    == pdmProductItemAttribute.Attribute
       && ecoResAttribute.Name     == "Supplier";
    {
        ecoResValue = EcoResValue::find(pdmProductItemAttribute.Value);
        returnValue = ecoResValue.value();
    }

    return returnValue;
}

4. Now on the newly added form control --> dimension  --> in the properties window -->
datasource  -- InventSum
datamethod -- displayDimension

5. supplier -->
datasource  -- InventSum
datamethod -- displaySupplier