Change Measurement Units of a Report
For your report, you can choose its global Measure Units, which can be set to Hundredths of an Inch, Tenths of a Millimeter, or to Pixels.
To specify the Measure Units property, switch to the Properties Panel and select the report in the Report Controls drop-down list. Then, expand the Actions or Behavior category and set this property to the required value.
This defines the basic measurement unit for all the unit-related options of a report and its bands and controls (such as location, size, border width, etc.). And this determines the measurement unit of the report's Snap Grid.