This is normal – the drain pump cannot remove the last 100ml of water in the sump (the lowest basin). However, if there is more than an inch, check the drain hose is elevated correctly (not lying flat on the floor). See the installation section of the manual.
For those needing specific performance data: fagor fi80 dishwasher manual
The FI80 has two racks and a cutlery basket. The original manual emphasizes these rules to avoid poor washing results: This is normal – the drain pump cannot