Why does Receiver Bitslip not work in Low Latency PHY IP for Stratix V GX devices?

Description

Quartus® II 10.1 and 10.1 SP1 software incorrectly allows you to select the RX Bitslip option.  Receive Bitslip option is not supported in Low Latency PHY IP for Stratix® V GX devices. This option should not be selectable in IP Megawizard™ flow. 

This issue will be fixed in future Quartus II software versions.