Chairman requests adding a motion to agenda of EGM, but got refused by strata manager

There's a lot going on within our strata, mainly the strata manager is ignoring the residential owners but bias on the commercial lot owner who referred them from the beginning.

Me, being the chairman requested the strata manager to add a motion of removing the unapproved shed built by the commercial owner in the common area to the Agenda of our next EGM, however last week when I received the Notice of EGM, the motion was not there. I then sent an email to the strata manager including all owners and ECs, total people ask for the reason. She reply that I have to raise the issue to the Secretary first. 

Is it how the process supposed to be? I am one of the main ECs. 

If I do have to report to the Secretary, why she didn't tell me when I raise the issue to her at the first place before the Notice of EGM was sent to us.

Please help!