Use of " NOT" keyword ??

Hello all,
I have declared a Parameter Variable like below.
Parameter : p_file type localfile .
At selection-screen.
If p_file is NOT initial.
Here i want to Fire error message .
Endif .
But i am getting this error "" Incorrect logical expression: Comparison / SELECT-OPTION can only be followed by "AND", "OR" or ")
But if i use like this .
If NOT p_file is initial.
Error message .
Endif .
it works fine,
So what is the basic difference of this two use and why in first case its showing me error. ???
please share your knowledge ..
Edited by: sagar singh on May 4, 2011 5:45 PM
Edited by: sagar singh on May 4, 2011 5:46 PM
Edited by: sagar singh on May 4, 2011 5:48 PM

The syntax "... IS NOT INITIAL" is only available since a certain ABAP release, it might have been 6.10 or 6.20, check ABAP online help for the exact details. You are probably working with an older release, where only "NOT ... IS INITIAL" is allowed.
Thomas

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