How to explode BOM through X++ BOM Explode and subBOM X++ BOM versions and BOM

class BOMDesign
{
TmpBOMExplode tmpBOM;
}
private int InsertParentItem(ItemId _itemId, int _level)
{
InventTable inventTable;
;

//Gets the parent information and then insert on TmpBOMExplode Table with level 0.
select firstOnly inventTable where inventTable.ItemId == _itemId;

tmpBOM.ItemId = _itemId;
tmpBOM.ItemName = inventTable.itemName();
tmpBOM.Level = _level;
tmpBOM.BOMQty = 1 ;
tmpBOM.insert();

return _level+ 1 ;
}

boolean hasChild(ItemId _itemId)
{
BOMVersion bomVersion;
;

//Check if the item is also a BOM item.
select firstonly bomVersion
where bomVersion.ItemId == _itemid
&& bomVersion.Active
&& bomVersion.FromDate <= systemdateget () && (!bomVersion.ToDate || bomVersion.ToDate >= systemdateget ());

if (bomVersion.RecId)
return true ;

return false ;
}


void itemExplode(ItemId _ItemId, int _level = 0, BOMQty _bomQty = 1)
{
BOM bomTable;
InventTable inventTable;
BOMVersion bomVersion;
InventDim   inventDim;
;

//Insert parent Item
if (_level == 0)
_level = this.InsertParentItem(_ItemId, _level);

//Verifies if the Item exists in BOMVersion Table.
//The item must be active and not expired.
while select firstonly bomVersion
where bomVersion.ItemId == _itemid
&& bomVersion.Active
&& bomVersion.FromDate <= systemdateget() && (!bomVersion.ToDate || bomVersion.ToDate >= systemdateget());
// optoin comparing with Dimensions//
/*
exists join inventDim
            where inventDim.inventDimId == bomVersion.InventDimId &&
                  (inventDim.InventColorId == inventColorId || inventColorId == "") &&
                  (inventDim.InventSizeId == inventSizeId || inventSizeId == "");
*/
{
if (bomVersion.RecId)
{
//Every item on BOMVersion has a BOMId which is used to show
//which products belong to a BOM Item.
While select bomTable
where bomTable.BOMId == bomVersion.BOMId
join inventTable
where bomTable.ItemId == inventTable.ItemId
{
//Insert the items that compose the BOM Item with level 1.
tmpBOM.ItemId = bomTable.ItemId;
tmpBOM.ItemName = inventTable.itemName();
tmpBOM.RefItemId = bomVersion.ItemId;
tmpBOM.BOMQty = bomTable.BOMQty / bomTable.BOMQtySerie * _bomQty;
tmpBOM.Level = _level;
tmpBOM.insert();

//This method is used to check if the BOM Item is composed by
//another BOM Item, case true it will call the method recursively
// with level 2.
if (this.hasChild(bomTable.ItemId))
this.itemExplode(bomTable.ItemId, _level+ 1, tmpBOM.BOMQty);
}
}
}
public static void main(Args args)
{
BOMDesign bomDesign = new BOMDesign();
;

bomDesign.itemExplode( 'D0001', 0 );
}
}

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