>Silly me! By being the two fields integers, the expression field1+field2 was summing, not concatenating the two values. Am I right?. As a matter of fact those two fileds didn't have to be numeric. What was I thinking? :(
>Well, another thing learned. :)
>
>Ulises

Glad to see you figured out the problem. You're correct, it was summing the fields, not concatenating them. You can convert these fields to a string for indexing purposes (See the STR() function), or since you say these fields shouldn't have been numeric in the first place, that will also solve the problem.