For Dimensions projects, you can require users to check files out before working on them (also known as working pessimistically) by setting an option in the dm.cfg file on the Dimensions server. You must set the configuration symbol DM_VISUALSTUDIO_PESSIMISTIC to yes (y) as follows:
DM_VISUALSTUDIO_PESSIMISTIC y
Please see the Dimensions CM System Administration Guide for detailed information on setting options in the dm.cfg file.
Caution!
When you work in pessimistic mode, a warning is displayed when you click the Cancel button while checking out a project file. The warning states that the action could not be completed. You can ignore this warning.
In certain situations an alert appears that states that conflicting modifications have been made to a solution file. You should choose the Overwrite option.