MSS Substitution - Position Based and Change Fields

Hi Experts,

We are on EHP7 and using NWBC (POWL) for work item. We have set-up position based substitution. But when the user logs in, he/she don't see work item of other user. We have set-up A210 relationships between positions. Do we need to set-up anything else?

Second Question,

On MSS when we set-up substitution, it shows Assignee -  PERNR not User Name. How can we change the fields to show User Name instead of PERNR?

Regards,

Ashish