Prevent unwanted input data

E

Esther

I have 3 combo boxes on a continuous form. The combination of the
information in the three combo boxes has to be unique. So if one record
contains the combination A, B, C the next record can not have that same
combination.

The data on the form all comes from the same table. I've tried to use a
multiple-field primary key in the table, but that doesn't work. How do I get
this to work?

(I use Access 2000.)

Esther
 

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