Hi Fran,
The Yes indicator for the "Iswaitingforsync" field or the checkmark for the label "Waiting for Sync Approval? for the "Estimate", "Receive Payment", "Sales Order", and "Invoices" screeens, will prevent the transactions from being sent over to QuickBooks until the checkmark is "Unchecked" or marked "No" with your approval.
The "TxnMethodFlag" field is a field that allows you to flag additional data being added to a transaction such as notes.
I hope that this helps.
Ronen