Error in Value

[BCMNORTH]

Would greatly appreciate any help on the following:

I use the following fuction in a cell:
=IF(COUNTBLANK('C:\Documents and Settings\efthimis\My Documents\EFTHIMIS\BCM\CUSTOMERS\IND-112 ΕΛΒΕ\IND112-1\[IND112-1 ΠΟΡΕΙΑ ΕΡΓΟΥ & ΑΝΑΛΥΣΗ ΑΜΟΙΒΗΣ.xls]ΠΟΡΕΙΑ ΕΡΓΟΥ'!L2:L4)=0;"ü";"")

If the file in reference is not open, I get a an 'Error in Value' message. Can anyone please explain to me why the function works only when the file in reference is open?

Thanks in advance

 

[slurpee55]

Excel cannot read from another file (well, except for the other file's properties) unless the other file is open, so the formula cannot operate.
However, you should be able to get a macro that will cause one file to open another - read here:
http://www.mrexcel.com/archive/Formulas/28618.html

 

[BCMNORTH]

Thanks slurpee55. I will check the macro option and I'll come back to you. But, can you in the meantime explain to me why the following formula (right in the next cell) is working perfectly?

=IF('C:\Documents and Settings\efthimis\My Documents\EFTHIMIS\BCM\CUSTOMERS\IND-113 DOPPLER\IND113-1\[IND113-1 &#928;&#927;&#929;&#917;&#921;&#913; &#917;&#929;&#915;&#927;&#933; & &#913;&#925;&#913;&#923;&#933;&#931;&#919; &#913;&#924;&#927;&#921;&#914;&#919;&#931;.xls]&#928;&#927;&#929;&#917;&#921;&#913; &#917;&#929;&#915;&#927;&#933;'!G5<>"";"ü";"")

 

[slurpee55]

I am guessing here that it is the difference between
=0 (an absolute test)
and
<>"" (since it can be null for a positive response, I would guess you are getting "ü" as the answer?)
It has to do with the type of logic employed in the test, I think, but I have never really looked into that....