Absolutely. You should never interfere with your child's other parent's parenting time. Your parenting order is a court order. Even if you think you have a very good reason for denying parenting time, you could face serious consequences. Instead, you should seek to have the parenting order modified.
Once you have an order in place regarding parental decision making and parenting time, you may expect everything to continue as normal. Then, one day, everything changes. You lose your job or your ex loses their job. Or another crisis emerges that requires you to change your parenting and/or child support order.
Deciding who will get the kids over spring break may be as simple as consulting your divorce agreement, but you need to structure it right.
There are special rules in Arizona if one parent wants to move away with a child. Generally, when both parents share legal decision-making authority and substantially the same parenting time, the moving parent is expected to give 45 days' notice before either: