OK. According to this, rules are not supported on RB750 but it is on RB750G:
http://wiki.mikrotik.com/wiki/Switch_Chip_Features
This one had similar problem:
http://forum.mikrotik.com/t/switch/33206/1
Get RB750G. 
OK. According to this, rules are not supported on RB750 but it is on RB750G:
http://wiki.mikrotik.com/wiki/Switch_Chip_Features
This one had similar problem:
http://forum.mikrotik.com/t/switch/33206/1
Get RB750G.