belongsTo(Quote::class); } public function product() { return $this->belongsTo(Product::class); } public function packaging() { // Assuming ProductPackaging model exists return $this->belongsTo(\App\Models\Stock\ProductPackaging::class, 'packaging_id'); } public function tvaRate() { // Assuming TvaRate model exists return $this->belongsTo(\App\Models\TvaRate::class, 'tva_rate_id'); } }