Fine
kindly use update statement like this
update billcycles set BCH_RUN_DATE = @EX_BCH_Update_Date, LAST_RUN_DATE = @EX_Last_Date_BillRun , FUP_ACCOUNT_PEROD_ID = @Ex_Only_Date_Bill_Run
where billcycle in (@DB_Bill_Cycle)
Kindly try this and let know for any queries or clarification
Cheers @Abhinandan