When using the Connect or Export application to sync Invoices to your accounting system, you will store settings within Synergy. One of these settings is the start from date - essentially from what date do you want to start syncing records. Any Invoice or Credit created before that date, will not sync to your accounting system.
If you happen to back date a Credit BEFORE this date, it will not sync to your accounting system.
Refer to the Settings topic for either MYOB Connect or Quickbooks Connect and change the Start from date.
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