QuickBooks Online sync error: Cannot delete Customer: This customer cannot be deleted because there are unbilled charges for this customer
Why the sync error occurs
This error occurs when a deleted customer in Bill Manager is trying to sync to QuickBooks Online, but the customer is linked to active/unbilled charges in QuickBooks Online.
How to fix the sync error
Reactivate the customer in Bill Manager until the charges are completed in QuickBooks Online, or delete the unbilled charges in QuickBooks Online and sync again.
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