VIP Classic Premier - IRP5 code - not allowing not code to be added

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hi

i have installed the update for June and have added TERS payment on the earning definition screen. it does not allow my IRP5 coloumn to be blank. when selecting not used, it will not let me save the changes as it says not all the coloumns have been filled in.

please assist URGENTLY with t his as i need to complete my payroll ASAP. i use VIP Classic