Use the REXX TAUENXSL to set the correct SYSLIB datasets if you want to support syntax checking in the context of the Enterprise Developer COBOL and PLI editor.
The SYSLIB values defined in TAUENXSL allow the editor's background parser to resolve COBOL copybooks or PLI includes.
If the Endevor Attachment is used in an RDz environment you have to set an existing Property Group and the Property Group Category, which will be used as a template to associate the SYSLIB datasets. Although both values are not relevant in the Enterprise Developer IDE, you still have to specify a non-blank value, such as NONE.