Para master sekalian ane ada masalah dengan coding, mohon bantuannya:

public function action_delete_existing_mvr_material(){

 $post = $_POST;

 $material_model = Model::factory('material');

 $receiving_model = Model::factory('receiving');

 

 $material_number = $post['material_number'];

 $heat_number = $post['heat_number'];

 $material_mvr_relation_id = $post['material_mvr_relation_id'];

 $result = $post['result'];

 $mvr_number = $post['mvr_number'];

 

 if($result==0){

 $material_mvr_relation = $receiving_model->get_material_mvr_relation_by_id($material_mvr_relation_id);

 $material_identification = $material_model->get_material_identification($material_number,$heat_number);

 $material = $material_model->get_material($material_number);

 $material_identification1['balance'] = $material_identification->balance-$material_mvr_relation->quantity;

 $material1['balance'] = $material->balance-$material_mvr_relation->quantity;

 $material_model->update_material_identification($material_identification1,$material_number,$heat_number);

 $material_model->update_material($material1,$material_number);

 }

 $receiving_model->delete_material_mvr_relation_by_id($material_mvr_relation_id);

 $material_mrr_relation['verified'] = 0;

 $material_mrr_relation['mvr_number'] = NULL;

 $receiving_model->update_material_mrr_relation_by_mvr_number_material_number_heat_number($material_mrr_relation,$material_number,$heat_number,$mvr_number);

Dari $result==0 diatas ada tiga nilai yaitu 0,1,2. Jika nilainya 0 tdk masalah tapi kalau bernilai 1 harusnya tidak terjadi pengurangan pada

$material_identification1['balance']

Apa yang harus dilakukan ya? Tambahan: memakai framework kohana, Trims.