Itr refund help requested

Hi All.

I was an expat deputed outside India by my Indian company from 1st April 2017 till 28th Dec 2017.

During this period i paid taxes in my deputed country on (local salary+ Indian salary converted into local currency)

However when i came back to India, my employer deducted retrospective tax from Apr- Dec 2017 in my Jan 2018 salary.

My doubt is am i eligible to get a refund on retrospective tax deducted for the month of Apr - Dec 2017 as i have already paid taxes in this period in my depute country.

Please help , your suggestions are welcome. 

Thanks in Anticipation