It is a general rule which governs all tenders and bids for government projects that negotiations are not allowed. This rule shall apply to PPP tenders also. Otherwise it will undermine government's policy on transparency and even-handedness.
The PPP procurement process has been designed to allow public agencies to gather private sector feedback in a transparent manner before calling for tenders. In particular, the Market Sounding and Market Feedback phases provide the opportunity for interested PPP partners to give their comments on the features of the PPP proposal before government agencies issue the final invitation to bid for the project.