See Reverse Engineering - DB2 UDB v. 8 (LUW) for more information.
Aliases (Synonyms) are supported, including Public Synonym:
Public Synonym specifies that the alias is an object in the system schema SYSPUBLIC.
To select a sequence in the list of objects, open the Synonym Properties dialog | General tab | Object box.
If the sequence is not defined in the model, select the Base Object is not in List checkbox and write the sequence to box Base Object Name (start with text SEQUENCE).
Other objects in Model Explorer: