Thanks for the valuable guidance on the issue.
There is nothing wrong in form 26AS . All the details are o.k and in order.
Mismatch appear to have been occurred between Tax Computation & the Credits available in form 26AS. Tax Credit of Rs.9315/-ONLY in item number 1 of Part A of 26AS for the AY:2010-11 has been taken into account for computation out of the total amount of tax credits of Rs.26655/-(PART A 9315+4680 + PART C 12660).
I do feel the feasible REDRESSAL through E-Nivaran link on Efiling site only.
Again with thanks and regards.