Error - 'User {x} is not permitted to insert this transaction...' when submitting or posting timesheets

This issue normally occurs when a user has been given No Access to the Access Financials database
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In order for a user to be able to post to Access Financials, they require some level of access to the database.
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If the Access Evo Membership role is set to No Access to the Access Financials instance, then there is nothing in the application which can enable the posting to Access Financials.