"TEST" seems to be good.
You have not mentioned it explicitly but I guess you cannot get the label printed. If so, have you tried to switch "Print by" to SFC instead of Shop Order? Have you tried setting up the document with "com.sap.me.document$*" plug-ins as described in the Guide and online help?
You might try to turn on ME logging to check what happens during the disposition - if there is ever any hint about triggering printing action.