How to set "Annuity Installment" field as "Required Field" under Conditions tab in IT0045?

Dear Experts,

My Client's requirement is to make the "Annuity Installment" as the "Required Field" under the Conditions tab in IT0045.

When I Am trying to make it as Required Field through module pool MP004500, corresponding to P0045-ANRTE field no radio buttons are appearing as shown below where as for other fields like P0045-TILBT radio buttons are appearing and able to make it as Required Filed.

Experts could you please help me to make the "Annuity Installment" field as " Required Field" and explain what are the reasons for not appearing the radio buttons corresponding to P0045-ANRTE field?

Thanks & Regards,

Mastan Shaik.