Error QD1018 occurs when a customer payment recorded in QuickBooks does not successfully get synced to Viewpost. If there is more than one payment receipt being synced, the ones without errors will sync.
A customer payment recorded in QuickBooks will not sync to Viewpost if certain fields are not completed. Verify that the date and check number fields on the payment receipt screen have been completed. Try to sync again after completing these fields.
Credit card payments posted by Intuit may not sync as the reference number field is sometimes left blank by Intuit and the reference field is marked as uneditable by Intuit. In this case, the payment will need to be manually entered in Viewpost.