Form 16a tds credit to foreign country - audit documents

Tejas (Account Assistant)     03 November 2017

Dear all,

CASE-

I work in a company from Taiwan. Its name is COC. TDS is deducted in India for the period Apr 2017 to June 2017. Now, COC want to take credit of TDS in taiwan under DTAA and under Section 90. 

QUESTION- 

What Documents/forms are required to take credit in Taiwan? Steps/Process to get these documents?

Thanks