diff --git a/app/Http/Controllers/Settings/Currencies.php b/app/Http/Controllers/Settings/Currencies.php
index d0936c2a3..02c6a37d2 100644
--- a/app/Http/Controllers/Settings/Currencies.php
+++ b/app/Http/Controllers/Settings/Currencies.php
@@ -95,18 +95,56 @@ class Currencies extends Controller
      */
     public function update(Currency $currency, Request $request)
     {
-        $currency->update($request->all());
+        $canDisable = $currency->canDisable();
 
-        // Update default currency setting
-        if ($request['default_currency']) {
-            setting()->set('general.default_currency', $request['code']);
-            setting()->save();
+        if ($canDisable === true) {
+            $currency->update($request->all());
+
+            // Update default currency setting
+            if ($request['default_currency']) {
+                setting()->set('general.default_currency', $request['code']);
+                setting()->save();
+            }
+
+            $message = trans('messages.success.updated', ['type' => trans_choice('general.currencies', 1)]);
+
+            flash($message)->success();
+        } else {
+            $text = array();
+
+            if (isset($canDisable['company'])) {
+                $text[] = '<b>' . $canDisable['company'] . '</b> ' . trans_choice('general.companies', ($canDisable['company'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['accounts'])) {
+                $text[] = '<b>' . $canDisable['accounts'] . '</b> ' . trans_choice('general.accounts', ($canDisable['accounts'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['customers'])) {
+                $text[] = '<b>' . $canDisable['customers'] . '</b> ' . trans_choice('general.customers', ($canDisable['customers'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['invoices'])) {
+                $text[] = '<b>' . $canDisable['invoices'] . '</b> ' . trans_choice('general.invoices', ($canDisable['invoices'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['revenues'])) {
+                $text[] = '<b>' . $canDisable['revenues'] . '</b> ' . trans_choice('general.revenues', ($canDisable['revenues'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['bills'])) {
+                $text[] = '<b>' . $canDisable['bills'] . '</b> ' . trans_choice('general.bills', ($canDisable['bills'] > 1) ? 2 : 1);
+            }
+
+            if (isset($canDisable['payments'])) {
+                $text[] = '<b>' . $canDisable['payments'] . '</b> ' . trans_choice('general.payments', ($canDisable['payments'] > 1) ? 2 : 1);
+            }
+
+            $message = trans('messages.warning.disabled', ['type' => trans_choice('general.currencies', 1), 'text' => implode(', ', $text)]);
+
+            flash($message)->warning();
         }
 
-        $message = trans('messages.success.updated', ['type' => trans_choice('general.currencies', 1)]);
-
-        flash($message)->success();
-
         return redirect('settings/currencies');
     }
 
diff --git a/app/Models/Setting/Currency.php b/app/Models/Setting/Currency.php
index b21348a89..42cfc1716 100644
--- a/app/Models/Setting/Currency.php
+++ b/app/Models/Setting/Currency.php
@@ -25,31 +25,70 @@ class Currency extends Model
 
     public function accounts()
     {
-        return $this->hasMany('App\Models\Banking\Account');
+        return $this->hasMany('App\Models\Banking\Account', 'currency_code', 'code');
     }
 
     public function customers()
     {
-        return $this->hasMany('App\Models\Income\Customer');
+        return $this->hasMany('App\Models\Income\Customer', 'currency_code', 'code');
     }
 
     public function invoices()
     {
-        return $this->hasMany('App\Models\Income\Invoice', 'code', 'currency_code');
+        return $this->hasMany('App\Models\Income\Invoice', 'currency_code', 'code');
     }
 
     public function revenues()
     {
-        return $this->hasMany('App\Models\Income\Revenue', 'code', 'currency_code');
+        return $this->hasMany('App\Models\Income\Revenue', 'currency_code', 'code');
     }
 
     public function bills()
     {
-        return $this->hasMany('App\Models\Expense\Bill', 'code', 'currency_code');
+        return $this->hasMany('App\Models\Expense\Bill', 'currency_code', 'code');
     }
 
     public function payments()
     {
-        return $this->hasMany('App\Models\Expense\Payment', 'code', 'currency_code');
+        return $this->hasMany('App\Models\Expense\Payment', 'currency_code', 'code');
+    }
+
+    public function canDisable()
+    {
+        $error = false;
+
+        if ($this->code == setting('general.default_currency')) {
+            $error['company'] = 1;
+        }
+
+        if ($accounts = $this->accounts()->count()) {
+            $error['accounts'] = $accounts;
+        }
+
+        if ($customers = $this->customers()->count()) {
+            $error['customers'] = $customers;
+        }
+
+        if ($invoices = $this->invoices()->count()) {
+            $error['invoices'] = $invoices;
+        }
+
+        if ($revenues = $this->revenues()->count()) {
+            $error['revenues'] = $revenues;
+        }
+
+        if ($bills = $this->bills()->count()) {
+            $error['bills'] = $bills;
+        }
+
+        if ($payments = $this->payments()->count()) {
+            $error['payments'] = $payments;
+        }
+
+        if ($error) {
+            return $error;
+        }
+
+        return true;
     }
 }
diff --git a/resources/lang/en-GB/messages.php b/resources/lang/en-GB/messages.php
index c65a8511e..36961b225 100644
--- a/resources/lang/en-GB/messages.php
+++ b/resources/lang/en-GB/messages.php
@@ -12,6 +12,7 @@ return [
     ],
     'warning' => [
         'deleted'           => 'Warning: You are not delete :type. Because it has :text',
+        'disabled'          => 'Warning: You are not disable :type. Because it has :text',
     ],
 
 ];