Error - 'Failed to retrieve data from the database. Details: [Database Vendor Code:50000]...' when submitting VAT return

This error occurs because the system thinks that someone else is running the VAT Return. Please check that someone else is not running the VAT return.
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To resolve this issue - our support team will need to investigate, run scripts or liaise with the hosting or development teams. Any Issues with contacting us, please see the following Get support in Access Financials.