diff --git a/app/Models/Purchase/Bill.php b/app/Models/Purchase/Bill.php
index 1fa14d2ce..46a018a31 100644
--- a/app/Models/Purchase/Bill.php
+++ b/app/Models/Purchase/Bill.php
@@ -117,6 +117,11 @@ class Bill extends Model
         return $query->where('status', '<>', 'paid');
     }
 
+    public function scopeNumber($query, $number)
+    {
+        return $query->where('bill_number', '=', $number);
+    }
+
     public function onCloning($src, $child = null)
     {
         $this->status = 'draft';
diff --git a/app/Models/Purchase/BillItem.php b/app/Models/Purchase/BillItem.php
index d2f8da66a..76ae399e0 100644
--- a/app/Models/Purchase/BillItem.php
+++ b/app/Models/Purchase/BillItem.php
@@ -34,7 +34,7 @@ class BillItem extends Model
 
     public function item()
     {
-        return $this->belongsTo('App\Models\Common\Item');
+        return $this->belongsTo('App\Models\Common\Item')->withDefault(['name' => trans('general.na')]);
     }
 
     public function taxes()
diff --git a/app/Models/Purchase/BillItemTax.php b/app/Models/Purchase/BillItemTax.php
index c13b1e405..06818f97c 100644
--- a/app/Models/Purchase/BillItemTax.php
+++ b/app/Models/Purchase/BillItemTax.php
@@ -4,11 +4,11 @@ namespace App\Models\Purchase;
 
 use App\Abstracts\Model;
 use App\Traits\Currencies;
+use Znck\Eloquent\Traits\BelongsToThrough;
 
 class BillItemTax extends Model
 {
-
-    use Currencies;
+    use Currencies, BelongsToThrough;
 
     protected $table = 'bill_item_taxes';
 
@@ -24,9 +24,14 @@ class BillItemTax extends Model
         return $this->belongsTo('App\Models\Purchase\Bill');
     }
 
+    public function item()
+    {
+        return $this->belongsToThrough('App\Models\Common\Item', 'App\Models\Purchase\BillItem', 'bill_item_id');
+    }
+
     public function tax()
     {
-        return $this->belongsTo('App\Models\Setting\Tax');
+        return $this->belongsTo('App\Models\Setting\Tax')->withDefault(['name' => trans('general.na')]);
     }
 
     /**