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到达order confirmation环节，点击最后complete checkout后提示如下：
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_np_gift_np_constituent_gft_dnr_cst_key". The conflict occurred in database "nfAIAA", table "dbo.np_constituent", column 'dnr_cst_key'. The statement has been terminated.
请教具体是什么问题，谢谢。

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