Text custom fields can be multiline up to 4000 bytes, for use in project detail pages (PDPs) and with workflows for demand management in Project Web App. Multiline text custom fields are not usable in Project Professional. so I added a Project level Multiline text field in my PDP & now I wanted to update this field in a given project from my PSI program.
Here is the code for the Console application :
1. You will need to add project web service (ProjectWebSvc) web ref in the solution: http://servername/pwa/_vti_bin/PSI/Project.asmx?wsdl
2. Its very basic code, which has TEXT_VALUE update for a Multiline field