Use BigDecimal for Pricedetail price field.

src/Form/Part/PricedetailType.php

@@ -44,10 +44,11 @@ namespace App\Form\Part;
 
 use App\Entity\Parts\MeasurementUnit;
 use App\Entity\PriceInformations\Pricedetail;
+use App\Form\Type\BigDecimalMoneyType;
+use App\Form\Type\BigDecimalNumberType;
 use App\Form\Type\CurrencyEntityType;
 use App\Form\Type\SIUnitType;
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\Extension\Core\Type\NumberType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -70,7 +71,7 @@ class PricedetailType extends AbstractType
                 'class' => 'form-control-sm',
             ],
         ]);
-        $builder->add('price', NumberType::class, [
+        $builder->add('price', BigDecimalNumberType::class, [
             'label' => false,
             'scale' => 5,
             'html5' => true,

src/Form/Type/BigDecimalNumberType.php

@@ -0,0 +1,63 @@
+<?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 Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Extension\Core\Type\NumberType;
+use Symfony\Component\Form\FormBuilderInterface;
+
+class BigDecimalNumberType extends AbstractType implements DataTransformerInterface
+{
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder->addModelTransformer($this);
+    }
+
+    public function getParent()
+    {
+        return NumberType::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);
+    }
+}