Hi Gowri!
The accrual process is done in 2 phases... the 1) accrual calculation run and the 2) accrual posting.
In 1) the system looks at the accrual period you selected and at all the relevant campaigns that are running during that time to see if any amounts have to be accrued (this will depend on the accrual method you chose, eg accrue over a period or at beginning of the campaign).
Then you can search for the accruals to review them and manually change if needed.
If all ok, you can then run the accrual posting job that will take those amounts and post them, at which point the posting will consider the actuals posted in the checkbook and post the delta in the accrual value category of the checkbook.
Let me know if this helps.
Anik