What is Transaction Locking?

When your business accounting period closes and you wish to freeze your transactions in the period from being modified or deleted is when Transaction Locking comes into play. Once Transaction lock in enabled, all transactions before the set date cannot be Edited or Deleted. Addition of new transactions are also restricted before the set date.

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Can I disable transaction locking to start modifying previous transactions?
Yes you can, just check the Enable Transaction Locking box off.
Will I be able to retrieve deleted transactions in Zoho Books?
No, once you delete a transaction, you cannot retrieve it in Zoho Books. However, you can view the transaction’s details from the Activity Logs and Audit Trial report. You can create a new transaction based on the details of the deleted transaction. ...
How can my customers pay an invoice via the portal?
After logging in to the customer portal, your customer can choose a transaction and click on the corresponding Pay Now button. A method of payment can also be chosen
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Why are Customer/Vendor Payments recorded against Unearned Revenue instead of Accounts Payable/Receivable?
When you receive an excess payment from a customer or record a single payment to multiple invoices, the payment is generally tracked under Unearned Revenue. Assume the case, where you receive $1000 from a customer. This is applied to 4 invoices, ...