Bulk SMS for arrear debtors

Bulk SMS for arrear debtors

Good Day

The current SMS system calls in the balance including the current period, even though the Age Analysis selection is for the past period amounts due. This creates confusion of arrears amount.

Eg: If Jan arrears is R100, Feb arrears is R100, and March current fees are R500, the SMS will read that R700 is due. How can the current perios amounts be excluded from the bulk SMS? I d not want to select "by value", as this is not accurate.
Thanks