Wrong financial year mentioned in tds return

yes we can rectify by writting the letter to the u tds circle officer by writting for rectification of  financial year after their updation after 10 to15 days, uwant make revised tds return.

Dear All,

I am working in a Construction concern, in our customer paid tds against our Company pan. In that they did a mistake in Assessment Year (2015-16) but they choose (2014 -15) and they gave a letter to Income tax officer but it will not rectify, can anyone guide me how it will rectify?