HI Cady,
You have to add BUS2000223 in generic outbound plug mappings for your navigation bar profile, but i guess it will be there already for your navigation bar profile.
The issue is in URL. In URL OBJECT_TYPE=BUS2000223 should be there not Z111.
Z111 is Process Type not Object Type.
Change the URL in code and check.
Regards,
Deepika