Thanks for getting back to us, YasirParvez.

I appreciate you following the steps provided by my colleague and for adding screenshots. This gives me an overview on what happened.

Allow me to chime in for a moment and help make sure that your concern is taken care of.

Since you’re getting an error when adding the item on the invoice, let’s check the item’s setup. The TYPE affects how the product/item is used on the transaction.

To review:

1. Go to List at the top menu bar.
2. Select Items, then choose donation.
3. Double-click the item name, then choose Edit.
4. Review the information.

If it’s entered as a discount, you cannot include it in an early payment. Please note that a discount subtracts a percentage or fixed amount from the total or sub-total.

To fix the issue, inactivate the donation, then create a new one and use the correct item TYPE. I'll guide you through the steps.

To inactivate:

1. Go to Lists at the top menu bar, select Item List.
2. Choose the list that contains the item.
3. Unmark the box for Include inactive.

To add a new item:

1. Go to List at the top menu bar.
2. Select Items.
3. Click on the Plus icon at the bottom list.
4. Under Type, click on the drop-down and select the appropriate category.
5. Fill in the fields.
6. Click on OK.

For more details about modifying products/items in QuickBooks, check out and bookmark this article and proceed to page 38: Desktop for Mac User's Guide.

Once done, you should now be able to create invoices and apply the payment smoothly. 

Let me know how it goes or if I can be of further assistance. I’ll be around to help and make sure you’re taken care of. Wishing you continued success.