R12 Delete entry in Project Bill Rate card Schedule

hello,

We are on 12.1.3 and have implemented Project billing. We are using employee bill rate card schedules.  Once an employee is assigned on the schedule, we cant delete the entry but have to put end date and start with the fresh assignment . Is there any way we can delete the entry on Bill Rate Card Schedule. I have come across one note

PAXSUDBR : Cannot Erase Or Delete New Row In Bill Rate Schedule (Doc ID 253739.1)

which is relevant for 11.9 , do we have any functionality in R12 to delete the entry in Bill Rate card

Appreciate response of experts

We would like to delete the entry after the bill rate card is assigned to Project.