This error occurs because the Constituent ID is an integration field (BB709167) between The Raiser's Edge and ResearchPoint. When synchronizing records, if the Lookup ID on the ResearchPoint record differs from the Constituent ID on The Raiser's Edge record to which you are linking, the RE Constituent ID overrides the original RP Lookup ID and becomes the imported record’s Lookup ID. This error indicates that there is another record in ResearchPoint that already has that ID number as the Lookup ID.

Change the Constituent ID on the Bio 1 tab of The Raiser's Edge constituent record to a value that is unique to both The Raiser's Edge and ResearchPoint.

For more information, refer to What fields integrate between ResearchPoint and The Raiser's Edge (BB709167)