getting error "Sales pricing is not permitted here (revenue determination type R)" while accessing sales pricing in ECP

Hi Experts,

I am trying to create a quotation from cProjects using ECP. i am getting below error while click on sales pricing button from Project Simulation.

Sales pricing is not permitted here (revenue determination type R)

note: I am using revenue calculation from Project Management option. We are using SAP PPM 6.0.

costing is working fine and i have also configured DIP and also simulated projects after linking the inquiry document to the project.

any help would be appreciated.

Thanks in advance,

Prabu