Hi Doug,
The Vendor Document Date on the Receipt is the date used for the GL Transaction Batch and the IC Transaction History.
The only 'receipt date' stored on the purchase order transaction itself is the Expected Receipt Date, which has no influence on 'real' receipt dates. If you meant something else, please clarify your comment that 'the p/o states a receipt date of December'.
It is possible to have a 'Document Date' on the Receipt Header tab different than the Vendor Document Date on the Totals tab, if you override the Vendor Document Date. If you ever change the Document Date on the Receipt Header, this automatically updates both the 'Actual Receipt Date' and 'Vendor Document Date' on the Totals tab. In case this is relevant to your question.
I don't believe there is an "error" here.
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Regards,
Softrak Tech Support