The Purchases tab stores AP related options for transactions transferred into QuickBooks Online.
Display UOM: If enabled, unit of measure will be appended to transaction detail description field for products and services.
Sync Unapproved Expenses: By default unapproved expenses in ConnectWise Manage will not be batched into QBO. If you wish to have unapproved expenses batched into Quickbooks Online then all you will need to do is enable "Sync Unapproved expenses".
Vendor Invoice Date Source: This source of “Bill date” to be used when creating Manage Item Receipts as Bills in QuickBooks Online. In this drop down you have three choices to choose from. You can choose which ever one fits your needs best.