if _, ok := priorityMap[strconv.Itoa(r.Priority)]; ok {
			return errReplicationUniquePriority
		}
		priorityMap[strconv.Itoa(r.Priority)] = struct{}{}

		if r.Destination.LegacyArn() {
			legacyArn = true
		}
		if c.RoleArn == "" && !r.Destination.TargetArn() {
			return errDestinationArnMissing
		}
	}
	// disallow combining old replication configuration which used RoleArn as target ARN with multiple
	// destination replication