Purchase against c form

Dear all Expert,

                           I want to know is this possible for a Registered DVAT dealer purchasing goods interstate against c form if he is not registered under cenral sale tax (registration and turnover) rules 1957,

because as per cst act 1956 central registration under form A is applicable only if dealer make interstate sale & charge cst from buyer, in my case only central purchase made, please suggest.

Regards

M.A. Ansari

Sr.Accountant