To generate an error message online, issue the ? n query (where n is the message number) at the FOCUS command level. This query displays the message number and text along with a detailed explanation of the message, if available. For example, if you receive the message

(FOC887) THE DDNAME CANNOT BE USED IN THIS CONTEXT

you can enter

? 887

to get this explanation:

(FOC887) THE DDNAME CANNOT BE USED IN THIS CONTEXT

The ddname mentioned is probably SYSPRINT, which cannot be used as a LOG file or TYPE file, since it conflicts with regular FOCUS terminal output. Use a different ddname.