In order to prevent beneficiary fraud, it is not possible to modify a beneficiary's key information, such as account holder name or number.
The only information that can be modified are the beneficiary's alias, address, and email address.
If you have created a beneficiary with incorrect information or if a beneficiary's information has changed, you first need to delete the beneficiary, before adding it again.
Go to Payments > Beneficiaries > Select beneficiary > Delete beneficiary to delete a beneficiary.