153B and 153C replaced the "Post Search Block Assessment Scheme" in respect of any search under Section 132A or requisition under Section 132A made after 31.05.2003. CBDT explained these provisions through circular dated 5.9.2003, which is reported in (2003) 263 ITR (St) 62. The said circular is as under: ………. 10. Under the block assessment proceeding under Chapter XIV-B only