chore: update document approval workflow and bug fixes

Modules/MasterData/app/Models/MaterialGroupItem.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Modules\MasterData\Models;
+
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\Pivot;
+
+class MaterialGroupItem extends Pivot
+{
+    protected $table = 'material_group_items';
+
+    public $incrementing = true;
+
+    public function group(): BelongsTo
+    {
+        return $this->belongsTo(MaterialGroup::class, 'material_group_id');
+    }
+
+    public function material(): BelongsTo
+    {
+        return $this->belongsTo(Material::class);
+    }
+}