diff --git a/app/Http/Controllers/HealthCareSheetController.php b/app/Http/Controllers/HealthCareSheetController.php
index b1d8a9a..ed3f707 100755
--- a/app/Http/Controllers/HealthCareSheetController.php
+++ b/app/Http/Controllers/HealthCareSheetController.php
@@ -840,29 +840,22 @@ class HealthCareSheetController extends Controller
                         if (!in_array($i->id, $prescriptionsIds)) {
                             continue;
                         }
+                        $itemIndex = array_search($i->id, $prescriptionsIds);
                         if ($i->billed) {
-                            return $this->errorResponse(__('errors.prescription_already_invoiced', ['id' => array_search($i->id, $prescriptionsIds) + 1]));
+                            return $this->errorResponse(__('errors.prescription_already_invoiced', ['id' => $itemIndex + 1]));
                         }
-
-                        $itemId = $i->id;
-                        $item->unit_price = array_filter($prescriptions, function ($r) use ($itemId) {
-                            return $r['id'] == $itemId;
-                        })[0]['unit_price'];
-
+                        $item->unit_price = $prescriptions[$itemIndex]['unit_price'];
                     }
 
                     if ($relation == 'exams') {
                         if (!in_array($i->id, $examsIds)) {
                             continue;
                         }
+                        $itemIndex = array_search($i->id, $examsIds);
                         if ($i->billed) {
-                            return $this->errorResponse(__('errors.exam_already_invoiced', ['id' => array_search($i->id, $examsIds) + 1]));
+                            return $this->errorResponse(__('errors.exam_already_invoiced', ['id' => $itemIndex + 1]));
                         }
-                        $itemId = $i->id;
-                        $item->unit_price = array_filter($exams, function ($r) use ($itemId) {
-                            return $r['id'] == $itemId;
-                        })[0]['unit_price'];
-
+                        $item->unit_price = $exams[$itemIndex]['unit_price'];
                     }