**Entry and Effect of Omitted Credit Purchase on Revaluation Account**

When a credit purchase worth 30000 has been omitted from the book, it means that the record of the transaction has not been made in the accounting books. However, the goods in question have been included in the stock. This error can be rectified by making necessary adjustments in the books of accounts.

**Entry under Revaluation Account**

To rectify the error of the omitted credit purchase, the following entry needs to be made under the revaluation account:

Revaluation Account Dr. 30000
To Credit Purchase Account 30000

**Effect of the Entry**

- Revaluation account is a nominal account, and hence, it is debited with the amount of 30000 to rectify the error of omitted credit purchase.
- On the other hand, the Credit Purchase account is credited with 30000 to make necessary adjustments in the accounting books.
- The balance of the Revaluation account will decrease by 30000, and the balance of the Credit Purchase account will increase by 30000.
- The effect of this entry will be reflected in the balance sheet, where the value of stock will increase by 30000, and the total assets will also increase by 30000.
- The net profit of the company will not be affected by this entry, as it is a rectification entry and not an actual transaction that affects the profitability of the company.

In conclusion, the omission of a credit purchase from the books of accounts can be rectified by making appropriate adjustments in the accounting books. The entry under the revaluation account will help to correct the error and ensure that the financial statements reflect the true financial position of the company.

It will be written as Revaluation ac dr. To creditors 30000