Transactions with inventory (QOH) products cant be dated earlier than the Inventory Start Date for the product

QuickBooks Online only allows selling items, if the order came after the product's inventory start date. If you sell an item before the date, QuickBooks will fail to create the item.

Problem

QuickBooks found a matching item, but the inventory start date is greater than the date of the sale.

Causes

Connex created the product

You made the product and entered an inventory start date of today. You performed a historical sync and the product was available prior to the date of first entry.

Solutions

Change the start date

By default, Connex assigns new products with a start date of January 1st of this year. If the order date is greater than the inventory start date, Connex will assign an inventory start date six months prior to the order date.

You set the start date to the day of entry:

How do I change the inventory start date of existing items?

Here are the steps:

1. Login to QuickBooks Online.
2. Click the gear box and click products and services.
3. To the right of the product, click the down arrow.
4. Click run report: 
   
5. Click the first entry:
    
6. Change the as of date to May 1st.
7. Click save.