The user edits a Data Change Request (DCR) field, but two Data Change Request records are created for modifying the same field.
DCR Field Type records of both DCR (or DCR Required) and DCR Editable (or DCR Editable Required) exist for the same field. However, only one DCR Field Type record is allowed per Record Type.
Remove one of the DCR Field Type records.
CRM Help Documentation: Configuration of DCR Controlled Fields