diff --git a/app/Http/Controllers/SystemController.php b/app/Http/Controllers/SystemController.php
index 6aad27f..2642ad5 100644
--- a/app/Http/Controllers/SystemController.php
+++ b/app/Http/Controllers/SystemController.php
@@ -386,6 +386,15 @@ class SystemController extends Controller
 			->where('point_id',$o->point_id)
 			->get();
 
+		if ($o->zone->domain->flatten)
+			$oo = $oo->merge(Address::withTrashed()
+				->whereIn('zone_id',$o->zone->domain->zones->pluck('id'))
+				->where('host_id',$o->host_id)
+				->where('node_id',$o->node_id)
+				->where('point_id',$o->point_id)
+				->get()
+			);
+
 		return view('system/address-merge')
 			->with('o',$o)
 			->with('oo',$oo);
diff --git a/app/Http/Requests/AddressMerge.php b/app/Http/Requests/AddressMerge.php
index 3949b42..7a3b9bf 100644
--- a/app/Http/Requests/AddressMerge.php
+++ b/app/Http/Requests/AddressMerge.php
@@ -42,7 +42,11 @@ class AddressMerge extends FormRequest
 					$dst = Address::withTrashed()->findOrFail($value);
 					$src = Address::withTrashed()->findOrFail($request->src);
 
-					if ($src->ftn !== $dst->ftn)
+					if ($src->zone->domain->flatten && $dst->zone->domain->flatten) {
+						if ((! $src->zone->domain->zones->pluck('id')->contains($dst->zone_id)) || (! $dst->zone->domain->zones->pluck('id')->contains($src->zone_id)))
+							$fail('Source must be Destination\'s domain zone');
+
+					} elseif ($src->ftn !== $dst->ftn)
 						$fail('Source and Destination must be the same FTN');
 				},
 			],
diff --git a/app/Models/Address.php b/app/Models/Address.php
index 44974f7..6e46df4 100644
--- a/app/Models/Address.php
+++ b/app/Models/Address.php
@@ -535,7 +535,6 @@ class Address extends Model
 		$o = (new self)
 			->select('addresses.*')
 			->join('zones',['zones.id'=>'addresses.zone_id'])
-			//->join('domains',['domains.id'=>'zones.domain_id'])
 			->when($trashed,function($query) {
 				$query->trashed();
 			},function($query) {