Any bills in which Basis of Computation has been set to Realisation even on crossing the service turnover of 50 Lakhs, or bills in which Basis of Computation has been set to Accrual even though the assessee has opted for Realisation basis in the Company information screen, can be viewed in Exception Reports.
Go to Gateway of Tally >Display > Statutory Reports > Service Tax Reports >Exception Reports > Basis of Computation
From the list of exceptions, you can change the Basis of Computation. Press the Spacebar to highlight a transaction or Ctrl + Spacebar to select all transactions.
Press Alt + S to change the Basis of Computation. This will be updated in the selected transactions.