How to amend the discount rate on a specific payment on the lease?

Summary:

we have a requirement from the customer to amend the discount rate index on one of the payments in the lease and keep the original rate on other payments. Is there a way to meet such a requirement?

Content (please ensure you mask any confidential information):

we have a requirement from the customer to amend the discount rate index on one of the payments in the lease and keep the original rate on other payments. Is there a way to meet such a requirement?

I tried and there is no update on the accounting subtab which presents the discount rate under the payment tab