John,

I think (I have to check, though) we have calculated logical field in our OutPut table. Now we're comparing results in Old system with the results in New System. In old file we have in this field either .t. or nothing, in new - .t. or .f. Perhaps, we have this field in our database, that's why we can have empty logical field in the old file. Let me check this guess, if it's true, this is an answer on my question. If it's not, I have to figure out, how is it possible...



>Why can't it be .T. or .F.? Just curious, because your answer may lie in how the data is represented in the interface and not how it's stored. You can format the display/report to show blank for .F.
>
>
>>Hi everybody,
>>
>>I have a problem, which seems to me have no solutions.
>>
>>I have a logical field, which I want to populate with .t. on some condition and leave blank otherwise.
>>
>>I have to create this field using IIF expression:
>>LogicalFiled=IIF (somecondition,.t.,.f.)
>>
>>My question is: How can I make this field blank, if !somecondition?
>>
>>Thanks in advance