Importing Microsoft Project to cProjects

Dear Experts

When importing MSP to cProjects, we want to update some information of tasks, such as task description but to keep other information like the assignment of role and resource by the same time.

Howerer, when I update current project with sturcture only, I get the following message. The system deleted and regenerated the tasks. So other information of tasks are missing after importing. I'm wondering does this have anyting to do with the mapping fields between MSP and cProjects.

Thanks for any clue. We are using PPM5.0.

Regards

Ymei