【Unity エラー】CS1612 : Mathf.Clamp

エラー内容
どうも一回要素を取り出してあげなければならないようだ。

Assets/Script/_Script_player2/PlayerManager.cs(20,35): error CS1612: Cannot modify a value type return value of `UnityEngine.Transform.position'.
 Consider storing the value in a temporary variable

修正前

void Update (){
	if(Input.GetKeyDown(KeyCode.Space)){
		iTween.PunchScale(gameObject,iTween.Hash("amount",
		new Vector3(0.1f,0.1f,0),"time",1.7f,"easetype",iTween.EaseType.easeOutCubic));

		transform.position.x = Mathf.Clamp(transform.position.x,-10,10);

	}
}	

修正後

void Update (){
	if(Input.GetKeyDown(KeyCode.Space)){
		iTween.PunchScale(gameObject,iTween.Hash("amount",
		new Vector3(0.1f,0.1f,0),"time",1.7f,"easetype",iTween.EaseType.easeOutCubic));

		Vector3 temp = transform.position;
		temp.x = Mathf.Clamp(temp.x,-10,10);
		transform.position = temp;

	}
}