1) YCS extranet>property setting>General info> model & permission> Occupancy model is set to "FPLOS".
2) Any pricing set previously via other pricing model is all deleted from YCS.
3) Please make sure that the CheckIn date send in the request minus maxAdvpurchase days is within the rate plan's sell date range (YCS extranet> Rates&Availibility> rate plan set up> Book dates in Pic2) showing on YCS UI.