def temp-table tt1 no-undo reference-only 
    field f1 as int.
define dataset ds1 reference-only  for tt1.

def temp-table tt2 no-undo reference-only 
    field f1 as int.
define dataset ds2 reference-only  for tt2.

procedure p0:
    define output parameter dataset for ds1 bind.
end.
   
run     p0(output dataset ds2 bind).