The Intuit Software Development Kit provides a fairly complete framework for the QuickBooks data extraction process - but there are also limitations and quirks which require a set of 'necessary practices' to avoid any potential synch or data accuracy issues.
Login to QuickBooks as Admin in Single User Mode and check the following Preferences (Edit>Preferences).
Accounting Preferences (Company) - All QuickBooks Versions
Integrated Applications Preferences (Company) - All QuickBooks Versions
Report Preferences (Company) - For QuickBooks Pro/Premier Only
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