X++ Code Snippet: Find available quantity from the physical inventory over all storage dimensions

display InventQtyAvailPhysical inventQtyAvailPhysical(
                                       ItemId _itemId)
{
    InventOnHand     inventOnHand = new InventOnHand();
    InventDimParm    inventDimParm;
    ;    
 
    inventDimParm.initFromInventDim(
                 InventDim::findOrCreatedBlank());
    inventOnHand.parmInventDimParm(inventDimParm);
 
    inventOnHand.parmItemId(_itemId);
    return inventOnHand.availPhysical();
}