Conditionally Required function not working properly

Hi,

I have one Text field ‘Site Meter Provider’ and one Currency field ‘Site Meter Provider Charge’ . I am writing a condition on Currency field (in Conditionally Required of field setup) stating, the currency field should become required only if that Text field is not NULL, i.e., Site Meter Provider Charge should become required only if Site Meter Provider is not NULL.

The condition written is :

[{stSite_Meter_Provider}] Is Not NULL

but this expression does not work.

‘Site Meter Provider Charge’ field is always displayed as required field irrespective of the condition.

Please help me in resolving this issue.