Limit of span session

[nawas]

This document tells that Cisco 4500 can have upto 5 span session. I currently have two running on my Cisco 4510 but I'm unable to create the third session and get the following message:

% This platform allows a maximum of 2 concurrent sessions with RX sources and

% 4 concurrent sessions with TX sources. (Bidirectional sources count as

% both RX and TX; remote VLAN sources count as RX.)

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml#support

[Lucien Avramov]

You can create 2 source sessions (span) and 3 destinations sessions (rspan), which makes a total of 5 sessions.

The document is mis-leading