Hello there, Info Accounting.

I see that it's really important for you to use and include the inventory items in your sales transactions without receiving the error mentioned. When we add inventory items to our invoice, the system required us to select an invoice date that comes after the date we use in the As of date of the item.

Let's make sure to double-check the Invoice date field and select the starting date of your item onwards.

It's how QuickBooks handles the quantity on hand of an inventory item from the date you started tracking them. If you want to keep that invoice date, we can adjust the Inventory Starting Value.

1. Go to Product and services and select the new inventory item.
2. Click Edit and select the starting value link.
   
3. Change the As of date.
4. Hit Save and close to reflect the changes.
   

Also, we can submit your suggestion to our product engineers so we can go easily track your inventory items to your sales transactions. Go to the Gear icon and select Feedback.

For more tips and guides while managing your inventory items, we can check this link: Manage your inventory, products, and services in QuickBooks.

If you need help handling items and transactions within your QuickBooks, please know that I'm here to help you anytime. Take care and have a good one.