Applies to: ConnectWise Manage, QuickBooks Online
How can this happen?
This normally means you have a vendor of the same name. You cannot have a customer (invoice) for a contact that is also a supplier (bill).
Quickbooks Online doesn't allow for a Company Account to be a Customer (Client) and a Vendor.
You will need to ensure that the records is separated.
If you have vendors that are customers, then you will need to prefix a new customer record in Connectwise (Vendor).