Log ID is Missing in Error Messages of Process Startup UI 
The error messages that the system displays in the process startup UI do not have the log ID attached.
Log on to the NetWeaver Administrator (NWA) application.
Select .
In the Show drop-down field, select Tracing Locations.
In the Category field, enter com/sap/tc/bpem/wdui/Procstarter and choose Go.
Set the Severity field to All.
Choose Copy To Filtered Sub-Tree.
Choose Save Configuration.