I have read the other posts similar to my question - but I still do not
understand. Please help.

My problem is I would like to lookup a code that is specific to a value to
determine if it exists in a table of data I have created. For example the
following table is named "DATA".

VALUE CODE
1111 505
1111 506
1111 507
1112 505
1112 609
1112 803

I have a value in cell F3 and a code in cell I3. I want to be able to
create a formula in cell M3 which will determine if I have a valid code for
the value. For instance I need to determine if code 505 is valid for Value
1111. Since it is I need a response of "Valid". On the other hand if I have
a code of 803 for value 1111 I need a response of "Invalid".

Thanks for your help!!