If you added the Meridian360 Portal page as a wizard page as described in Configuring the project folder type, then you also need to adjust the script event handler M360FolderGenericEvent_AfterNewFolder for your vault. This event handler is called after each new project is created and it does two things:
Makes a call to Meridian360 Portal to create a corresponding new project. Ensure that the Meridian360 Portal project name is set properly, for example, in vaults based on the BlueCielo Industry Template:
'<ITBS> projectName = Folder.Property("psProject.ProjectName") '</ITBS>
Adds the Meridian Enterprise project path to the table tblM360Projects. Ensure that the folder path is calculated properly, for example, in vaults based on the BlueCielo Industry Template:
'<ITBS> ProjectFolderPath = IIf(Folder.ParentFolder.Path <> "\", Folder.ParentFolder.Path & "\" & CalculateName, "\" & CalculateName) '</ITBS>