I am taking ACC 452 Advanced Auditing. We are using IDEA and I need help creating criteria to narrow my search. This is the problem"

With the Travel Report file open, on the Analysis tab, in the Extract group, select Direct to open the Direct Extraction window to find the number of records that occurred on and before January 15th , 2015 and involved at least 7,500 air miles or amounts of $5,000 or more.

I came up with DATE<="20150115" .AND. AIRMILES>="7500" .OR. AMOUNT>="5000". I receive an error message saying "mismatch field types"

PLEASE HELP!