Error - 'Posting Error: User (x) is not permitted to Insert this transaction' when approving a purchase request

This error is very likely to be caused by the user in question not having enough permissions in the Access Financials Database
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Without the correct permissions on the Access Financials Database the system will reject any attempt from a user in FinOps to update a transaction.
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Please check that the user has the correct security permissions in the Access Financials Database for the transaction type. By default when granting a new user access to FinOps, the corresponding user record should appear under the FINUSER security profile in Access Financials.
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If you do not see the user listed anywhere in these or other security profiles in Access Financials, please raise a new case online and reference the title of this article and please include details of the user expected to be seen.