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Deleted an column but can't reuse name
I deleted a relationship column because I was having trouble with deleting a row and I was suspicious of the relationship. After deleting the column the row was successfully deleted, however now I can't add the relationship column back since it says the column name is already being used.
TL;DR
Developer deleted a relationship column to troubleshoot row deletion issue. After successfully deleting the row, unable to add relationship column back due to name conflict.