Error: Data could not be saved. Cannot merge to an alternate lookup ID of this type when it already exists on another constituent when merging constituents.

When merging two constituents, the user gets Error:  Data could not be saved.  Cannot merge to an alternate lookup ID of this type when it already exists on another constituent.

The error is caused by the source constituent's lookup id already being populated on the target's constituent alternate lookup id with the same type that will be added during the merge.  To correct the error please delete or change the alternate lookup id type for the duplicate.

Environment

 2.5.465, patch 84

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