excise/custom duty

if  a EOU removes material to DTA, it has to charge aggregate of custum duties as per section 3 of central excise act. now my question is regarding billing of eou unit.

let me explain the billing

Mat xyz                   27.33 MT @   rs. 3360                   91839

assessable value                                                             91839

excise duty under sec. 3 of CE act                                 21098

edu cess @ 2% on cenvat                                               422

s&h edu cess @ 1% on cenvat                                        211

cst  @ 3%                                                                     3407

assessable value                             91839

bcd @ 5%                                        4591

cvd @ 16%                                     15428

edu cess @ 2%                                 308

s&h edu cess @ 2%                          154

edu cess(cus duty) @ 2%                  409

s&h edu cess(cus duty)   @ 2%         154

aggregate of duties of custom           21098

GRAND TOTAL                                                           116977

i totally understood the  yellow coloured highlighted computations but cant understand the blue coloured highlighted computations. why again the edu cess has been charged on aggregate of custom duties. i would like to have a detailed knowledge about this issue.