Is there an attribute that merges StockItem with CrossItem?

Why not simply use [CrossItem] ? The POReceiptLineInventory attribute simply inherits from CrossItem and adds a filter to prevent you from selecting items that have status set to No Purchases. CrossItemAttribute itself inherits from the same base class as StockItemsAttribute  - you don’t need to use StockItem as well.

    [PXDBInt()]
	[PXUIField(DisplayName = "Inventory ID", Visibility = PXUIVisibility.Visible)]
	public class POReceiptLineInventoryAttribute : CrossItemAttribute
	{
		public POReceiptLineInventoryAttribute(Type receiptType)
			: base(typeof(Search<InventoryItem.inventoryID, Where<Match<Current<AccessInfo.userName>>>>), typeof(InventoryItem.inventoryCD), typeof(InventoryItem.descr), INPrimaryAlternateType.VPN)
		{
			var condition = BqlTemplate.OfCondition<
				Where<Current2<BqlPlaceholder.A>, Equal<POReceiptType.transferreceipt>,
					Or<InventoryItem.itemStatus, NotEqual<InventoryItemStatus.noPurchases>>>>
				.Replace<BqlPlaceholder.A>(receiptType)
				.ToType();

			_Attributes.Add(new PXRestrictorAttribute(condition, IN.Messages.ItemCannotPurchase));
		}
	}

Thank you for your reply - I appreciate you digging into that.

I had tried adjusting the attributes via a Graph Extension but entering the barcode or global cross-reference returned an error.

  public class INTransferEntry_Extension : PXGraphExtension<INTransferEntry>

  {

    #region Event Handlers

    //[PXDefault()]

    //[StockItem(DisplayName="Inventory ID")]

    //[PXForeignReference(typeof(FK.InventoryItem))]

    [CrossItem]

    protected virtual void INTran_InventoryID_CacheAttached(PXCache cache)

    {

    

    }

    #endregion

  }
 

So maybe there’s something else going on within the Transfer logic that I need to dig through more because I get an on-screen error:

“Error: An error occurred during processing of the field InventoryID: Value cannot be null. Parameter name: key.”

The error trace starts with:

”The item InventoryID is not found (restricted:False,external:True,value:THATLEGOPT)“

Right on!  Thanks for digging into that!