I think what may end up happening is this...
If you have a doctor's note that restricts your performance on the job, then that is fine and that is legal.
But not all jobs can accommodate all medical restrictions. If the norm is for the employee to stand for the customer, then that is the employer's right to expect that from an employee. For whatever reason, he likes the image of the employee standing while the customer is being serviced.
He's the boss and he can decide the image he wants to portray to the public. If you are unable to do that, then he has the option of transferring you to a position that will accommodate your medical needs. I am sure he'd rather not do that though. Chances are, he wants to keep a trained person in your position. And he might not have another position to move you to, unless you are moved to another location.
You are also going to have to be cooperative in this. While it is certainly your right to follow your doctor's advice, it is also your duty to give the employer what he pays you for. It sounds like it turns into a struggle, rather than 2 adult people sitting down to come to an agreement. You each have something the other wants. Work it out. You may have to change jobs or be transferred though. Be prepared to be told that your job description requires you to stand for the customer, and if you cannot do your job during the crunch times, it is their right to remove you.
If you have a doctor's note that restricts your performance on the job, then that is fine and that is legal.
But not all jobs can accommodate all medical restrictions. If the norm is for the employee to stand for the customer, then that is the employer's right to expect that from an employee. For whatever reason, he likes the image of the employee standing while the customer is being serviced.
He's the boss and he can decide the image he wants to portray to the public. If you are unable to do that, then he has the option of transferring you to a position that will accommodate your medical needs. I am sure he'd rather not do that though. Chances are, he wants to keep a trained person in your position. And he might not have another position to move you to, unless you are moved to another location.
You are also going to have to be cooperative in this. While it is certainly your right to follow your doctor's advice, it is also your duty to give the employer what he pays you for. It sounds like it turns into a struggle, rather than 2 adult people sitting down to come to an agreement. You each have something the other wants. Work it out. You may have to change jobs or be transferred though. Be prepared to be told that your job description requires you to stand for the customer, and if you cannot do your job during the crunch times, it is their right to remove you.