chore: update document approval workflow and bug fixes

Modules/MaterialLogistics/app/Models/PurchaseOrderItem.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Modules\MaterialLogistics\Models;
+use Modules\MasterData\Models\Material;
+use Modules\MasterData\Models\MaterialGroup;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class PurchaseOrderItem extends Model
+{
+    protected $fillable = [
+        'purchase_order_id', 'material_id', 'material_requisition_item_id',
+        'quantity', 'unit_cost',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'quantity' => 'decimal:2',
+            'unit_cost' => 'decimal:2',
+        ];
+    }
+
+    public function purchaseOrder(): BelongsTo
+    {
+        return $this->belongsTo(PurchaseOrder::class);
+    }
+
+    public function material(): BelongsTo
+    {
+        return $this->belongsTo(Material::class);
+    }
+
+    public function requisitionItem(): BelongsTo
+    {
+        return $this->belongsTo(MaterialRequisitionItem::class, 'material_requisition_item_id');
+    }
+
+    public function getLineTotalAttribute(): float
+    {
+        return (float) $this->quantity * (float) $this->unit_cost;
+    }
+}
+