Excise credit

I am buyer (A Ltd), purchase goods from (B Ltd) on which excise is not applicale, only Vat is applicabe. company B Ltd. Purchase Goods from C Ltd,. on company C Ltd. excise is applicabe. now; company C ltd. directly send goods to A Ltd. . i have challan on which following details are mentioned Buyer name; B Ltd consignee name ; A ltd (availing modvat) and B Ltd issue separate invoice to A ltd on which only vat is mentioned I want to know on the basis of C ltd challan I (A LTD MANUFACTURER) can avail credit or not ???? plz reply me with reference to Rule .....