You can amend the rate code. For example, change the price from '$10 per day' to '$10 per week'.
This change results in a discounted rate that is credited to the customer.
Steps
Go to Rental order management > Rental invoicing > Project rental credit wizard.
In the Customer/Invoice account field, enter or select a value.
In the Invoice field, enter or select a value.
Click Next.
In the Amendment type field, select an option.
Click Next.
In the list, mark the selected row.
Click Fetch.
In the Rate code field, enter or select a value.
In the Reason code field, enter or select a value.
In the Text field, type a value.
Select Yes in the Recalculate price? field.
Click Add.