Project or network contains new objects

What causes this issue?

The system displays this message in one of the following situations:
You try to save a draft to an operative project or network to which
another user has added some objects
Using the shared mode, you try to save a project or network to which
another user has added some objects
<ZH>Note </>
The shared mode is only available if you have deactivated the default
Business Add-In (BAdI) implementation <NP>BADI_IMPL_PS_SHARED_MODE</>.
For more information, see Customizing for <LS>Project System</> under
<LS>Handling Large Projects </>-> <LS>Business Add-Ins</> -> <LS>Make
Settings for Project Editor</>.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The system displays a message that the project or network contains new
objects.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.