Expression Language: Value of field is based on another field's value

I have create a new text DFF.

The value of that DFF is based on the following:

1. If Batch Date is same as Accounting Date = SAME
2. If Batch Date is not the same as Accounting Date = DIFFERENT

The following is the expression I have made to achieve this:

#{(pageFlowScope.BatchNumber.inputValue) == (pageFlowScope.Description.inputValue) ? 'SAME' : 'DIFFERENT'}

As per my underestanding, pageFlowScope checks the current field's state (or value). However it does not work.