“The constituency cannot be deleted because the constituent is a prospect manager.” message occurs when trying to delete a Fundraiser constituency on a record that has multiple Fundraiser constituencies.
In order to become a Prospect manager, the constituent must have the Fundraiser constituency. Once this constituency is added and the constituent set as the Prospect manager for another constituent, the Fundraiser constituency cannot be removed without first removing the Prospect manager status. When attempting to remove the constituency without having removed the Prospect manager first, the error message “The constituency cannot be deleted because the constituent is a prospect manager.” occurs. This becomes an issue when there are multiple Fundraiser constituencies, and you want to remove one (or more) of them yet leave at least one remaining.
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