Use BigDecimal object type for Supplier shipping costs, instead of bcmath string.

src/Form/AdminPages/SupplierForm.php

@@ -44,6 +44,7 @@ namespace App\Form\AdminPages;
 
 use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\PriceInformations\Currency;
+use App\Form\Type\BigDecimalMoneyType;
 use App\Form\Type\StructuralEntityType;
 use Symfony\Component\Form\Extension\Core\Type\MoneyType;
 use Symfony\Component\Form\FormBuilderInterface;
@@ -73,7 +74,7 @@ class SupplierForm extends CompanyForm
             'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'move', $entity),
         ]);
 
-        $builder->add('shipping_costs', MoneyType::class, [
+        $builder->add('shipping_costs', BigDecimalMoneyType::class, [
             'required' => false,
             'currency' => $this->default_currency,
             'scale' => 3,

src/Form/Type/BigDecimalMoneyType.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Form\Type;
+
+
+use Brick\Math\BigDecimal;
+use Brick\Math\BigNumber;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Form\Extension\Core\Type\MoneyType;
+use Symfony\Component\Form\FormBuilderInterface;
+
+class BigDecimalMoneyType extends AbstractType implements DataTransformerInterface
+{
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder->addModelTransformer($this);
+    }
+
+    public function getParent()
+    {
+        return MoneyType::class;
+    }
+
+    public function transform($value)
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        if ($value instanceof BigDecimal) {
+            return (string) $value;
+        }
+
+        return $value;
+    }
+
+    public function reverseTransform($value)
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        return BigDecimal::of($value);
+    }
+}