Try, on the command line, Count for ... - make sure this returns the correct number and then copy and paste the condition into your replace statement.

>>Syntax looks fine. What is the error?
>>
>>>problem with sytax, this statement isn't working, are my brackets in wrong spot?
>>>
>>>replace all May_1998 with 2 for May_1998 = 0 and ((start_da < {1998/06/01}) and (final_da > {1998/05/01}))
>>>
>>>thanks in advance.
>
>Hi :
>
>not doing a replace when I have records that meet the criteria.