KLIST question

I have a logical over my invoices file, the KLIST for it is

 KEYINV    KLIST
           KFLD           CUSNO
           KFLD           CSITE
           KFLD           INVDT


My question is how can I retrieve all the invoices for a particular date
regardless of customer or site

I know I could simply create another logical, but it seems a little bit wasteful
to create a logical for just one report that will be run once a day.

I also know that I could do a OPNQRYF in my CL first and limit the records that
way and then read all records in my RPG/400.

Just wondering if there is a way to do it from within RPG/400.

Thanks,
Gary.


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