Salary from a cuntry with double taxation treaty

I worked till Feb, 2021 for an Indian based company, and hence have a form16 form them. But for month of March, I worked as a contractor for a company based in Europe. They paid me after deducting their local income taxes. India has double taxation treaty with that country. So how should I provide this information while filing ITR? I don't want to be taxed for my March salary in India as I have been already taxed in the country where the company is based.