Updating purchPurchaseOrderService after adding a new field into PurchTable

Hello,

I'm trying to update PurchPurchOrderService having added some new fields to the PurchTable. I've 'restored' the AxdPurchaseOrder query to include the new fields. I then go Tools - Development Tools - Application Integration Framework - Update Document Service, select PurchPurchaseOrderService, tick 'Regenerate data object classes' and 'Update AxBC classes' and click 'Ok'. After a while I get a message below

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I know the message means there is no datasource record, but what do I need to do to get rid of this error?

Any help much appreciated.

Thanks,

Mike