This error occurs when the attribute value for a modifier add is empty.
%s - attribute name.
Ensure that the modifiers have appropriate attribute values.
Example
[#Menu: Gateway of Tally]
Add: Item: "MyReport": Display: MyReport
[Report: MyReport]
Use : DayBook
Replace: Form: DayBook:
The form to be replaced is not given for the replace modifier error T0023: The attribute value for 'Forms' is empty within the modifier. appears.
[#Menu: Gateway of Tally]
Add: Item: "MyReport": Display: MyReport
[Report: MyReport]
Use : DayBook
Replace: Form: DayBook: BalanceSheet