By way of contrast, the RETURN ERROR statement can also be used to raise an AppError object. It raises ERROR and also provides the ability to specify a CHARACTER string that can be accessed in the caller (usually the ReturnValue property of the error object or the RETURN-VALUE function). The RETURN ERROR statement allows you to return an error object. For example:
IF CurrentTime > ClosingTime THEN
RETURN ERROR NEW Progress.Lang.AppError("Can't take a delivery order
after closing time.").
RETURN ERROR does not provide the UNDO action as does the UNDO, THROW statement.
The following language elements support a RETURN ERRORerror-object-expression action:
RETURN statement