When adding a new Constituent record, the record cannot be saved, because the ResearchPoint URL has not been added to the record.
The ResearchPoint URL can only be added by creating the Raiser's Edge record via integration with ResearchPoint. Having this field markes as required for records in The Raiser's Edge means ALL Raiser's Edge records must be created through ResearchPoint integration.
To remove the requirement in The Raiser's Edge:
Click on Config > Fields Select Prospect from the menu Unmark the checkbox in the ResearchPoint URL row, under the Required column