Pin sleep request problem

Hi all, I am new to XBee modules. I have XB24-DM module with version 804B. I would like to configure SLEEP_RQ pin to wake up my module from sleep. This pin is shared with DTR and DI8 pin. I read in the manual that to provide SLEEP_RQ function I have to set SM mode to 1 or 2. I am using X-CTU software to config module, but there is N/A possibility on this function set (1 and 2). Am I missing something? Please direct me to the success solution.

I have an application where module has to waked up by pin and after required communications it should go back to sleep by same pin.

Thank you for all your comments.