Trying to make things clear:

Database structu

date / name_of_security / P&L

Table Structure

Row input cell: <31-Jul-2002 / <31-Aug-2002 / ..... / <31-May-2005

Column input cell: Extract of unique names from the column name_of_security


that's where the problem starts. All the =MATCH() and =VLOOKUP() fuctions
are used at a later stage.



"Niek Otten" wrote:

Difficult to say without any formulas shown!

But it sounds a bit as if you're using VLOOKUP with the 4th argument omitted
or set to TRUE

--

Kind Regards,

Niek Otten

Microsoft MVP - Excel

"Dimitri Kryukov" <Dimitri wrote in
message ...
I am having a problem in a table that calculates P&L on each security in
the
database. It would not distinguish between different classes of security
even
though each security has a unique identifier.

For instance, it calculates SBER and SBERP as having identical P&L in a
month where only SBERP has produced P&L

In months where both securities produced P&L it calculates the results
accurately.

What am I doing wrong?