Cenvat credit against job work

Dear Sir, We have 2 units of same company. Both units are registered with excise. A unit do the job work for principal unit. A unit purchased some materials on paid the excise duty. These materials used for value addition to job work which received from principal unit. Please advice that can cenvat credit are allowed on these materials for A unit? If yes or not please advice with case. Thanks & Regards, Anuj Kumar Goel