output parameter in update operations

I have one MBO created from BAPI_INSPLOT_SETUSAGEDECISION by selecting

Input parameter :Inspection Lot Number,UD_Code,UD_Code_Group,UD_Plant,UD_Selected_Set

Output Parameter:Return

Created update operation with

Input parameter :Inspection Lot Number,UD_Code,UD_Code_Group,UD_Plant,UD_Selected_Set

Output Parameter:Return

There are two screen in workflow,

first screen has Lot Number,UD_Code,Code Group,Plant,UD Selected Set as fields and menu item update .

Type of menu item is online that invokes operation update of MBO created above .

Second screen I am trying to retrieve the output parameter of update operation ,but output parameter are not available on second screen