Diagnosis
cProjects uses integration with SAP Document Management (SAP DMS).
An error message was generated when saving document links after carryingout activity "&SYST-MSGV2&" in cProjects.
Sequence number of the message: &SYST-MSGV1&
This message was entered in the application log under the subobject "
Syst-msgv4".

Procedure
You can analyze the log in SAP DMS using transaction SLG1 "AnalyzeApplication Log".