A change has been made to the cashbook screen.
A transaction which has been disbursed or reconciled can no longer be deleted. In order to delete these transactions you will need to delete the associated bank reconciliation or disbursement first. Then you will be able to delete the transaction.
Also if you try to edit a transaction which is disbursed, you will not be able to change the amount or the property associated with the transaction.
If you try to edit a transaction which has been reconciled, you will not be able to change the amount.
These changes have all been make in order to maintain data integrity. Once a transaction has been disbursed, if you edit to delete the transaction, the disbursement becomes invalid. The same applies to reconciliation. You need to make sure your transactions are correct prior to doing your disbursements. If you later find out they are incorrect, you should create new adjustment type transactions rather than changing previous transactions which have already been paid out to owners.