Dear Friend,
The term ‘prior period items’, as defined in para 4 of AS-5 refers only to income or expenses which arise in the current period as a result of errors or omissions in the preparation of the financial statements of one or more prior periods. The term does not include other adjustments necessitated by circumstances, which though related to prior periods, are determined in the current period.
You should ask for the preparation of BRS to your client for the 12 years and see that whether the item for which the difference of 75k is acertained are INCOME or EXPENCE related.
Now you should pass the journal entry for the same in the books of account and after that it should be separately disclosed in the statement of profit and loss in a manner that their impact on the current profit or loss can be perceived.An alternative approach is to show such items in the statement of profit and loss after determination of current net profit or loss.