The "as of" of an inventory item is the date we record its quantity and cost in the accounting system that's why you're unable to create a backdated check, Handprint. Processing purchase orders from earlier dates is vital, so let's work together to modify the date and continue tracking the quantity accurately.

We can change the As Of Date to make backdated Check entries in the program. To do that, follow the steps below:

1. On the left panel, go to Sales and hover your mouse over Products & services.
2. Locate the item and select Edit.
3. Under the Inventory info section, click Starting value.
4. Adjust the AS OF DATE to the desired period to enter backdated transactions, then Save.
5. Click Save again.
6. Go to the +New button and select Check under the Vendors column.
7. Fill out the necessary information, then Save and close.

Moreover, adjusting the date will change the timing of when the inventory is recognized, which can impact financial reports and inventory valuation or cogs calculations. Thus, I highly recommend consulting an accountant to consider the implications and ensure these records are valid and consistent. If you don't have one, seek assistance from QuickBooks Live Expert Assisted to receive appropriate guidance on monitoring your supplies.

Here's an article explaining how items impacts your business reports: Impacts of inventory tracking on the Balance Sheet and Profit & Loss reports in QuickBooks Online.

Furthermore, use reports to see your sales and inventory status in QuickBooks Online to know your best sellers, on-hand items, and more.

For additional questions about tracing items and check arrangement, kindly add them below. We're here to support you in ensuring smooth financial and inventory management. Stay safe.