There appears to be an anomaly on the pending merge at the bottom of this profile page
The message recieved if one tries to reject the match is
John Abbe (Abbe-11) and John Abbe (Abbe-90) are already Rejected Matches.
The merge proposed lastly was 'proposed a merge of Abbe-157 and Abbe-11'
Subsequently Darrell Abbey edited the data for John Abbe Jr.. (Merged Abbe-157 into Abbe-11: Clear duplicate.)
What appears to have happened is that when they were merged for some reason the proposed merge remained but now is pointing at John Abbe (Abbe-11) and his son (Abbe-90) which is not correct as it is, as noted on the profile page, a rejected match. If one tries to reject it again one gets the message above. I believe it may have been because there was an impending merge on Abbe-90 with Abbe-157. Since 157 became 11 the 157>90 had become 90>11. Hope that makes sense!
That is OK that it gives the error message BUT it would cause a big problem if someone performed the merge not spotting the relationship.
Can this spurious proposed merge be removed from the system?