ConnectBooks stops a settlement when an inventory item in it has an Inventory Start Date in QuickBooks Online that's too late. The error lists the items and a date. Each item's Inventory Start Date must be before the date shown in the error.
How to fix it
In QuickBooks Online, go to Sales, then Products and services.
Open each item from the error. Change its Inventory Start Date to a day before the date shown in the error, and save.
In ConnectBooks, go to Accounting Export. Click the 3 dots on the settlement and choose "Resend to QuickBooks". If you see Settlement, COGS and Both, pick the one that shows the error.
Frequently asked questions
Is the date in the error the settlement's start date?
Not always. Use the date shown in the error.
There are a lot of items.
Each one needs its date changed. If the list is very long, contact support and we'll help.