COBCH1785 インライン署名ではパラメーターはオプションの RETURNING か YIELDING の直後でなければならない

When specifying an inline method signature, any RETURNING or YIELDING phrase must immediately follow the parenthesized parameter specification; for example:

method-id SplitTime (split-1 as decimal, split-2 as decimal) 
                                    returning diff as decimal public.
...
end method.