Why does an exception occur when a project is saved in Open Workbench for some users but not for others?

Document ID : KB000014905
Last Modified Date : 14/02/2018
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Some users cannot save Open Workbench projects back to CA PPM, and they receive the following error:

"Impossible to save the project <project>. An exception has occurred"

Why is this error happening?

All CA PPM / OWB versions.

Secured subpages in the project object can be the reason for the failure.

Secured subpages automatically create View and Edit rights over the subpage itself.

Please ensure that the users who are working with OWB do have appropriate access rights to project subpages.

If an attribute is placed on a secured subpage and you do not have the necessary rights to the subpage, you might get an error when trying to save the project from OWB back to PPM.