Error - 'A project and cost centre code must be specified when the Nominal account has been set up for compulsory costing'

One of the nominal accounts for a transaction being imported has the Compulsory Costing flag set in the Details tab. It will be necessary to untick this, or enter costing details into the import in order to continue.
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You could use Access Office Integration to establish which code is generating the error. The Compulsory Costing field in the Nominal Accounts template will show any records with the setting enabled.
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Where the error is showing in Datahub, it will be necessary to review the details of the transaction in the Messages area to identify which nominal accounts are being updated by the transaction.