title: How to create an AS/400 command with mutually exclusive parameters?
body: <p>I need to create an AS/400 command. Based on the requirement, it has two parameter, say A and B, which cannot be filled in the same time. Both will be displayed when F4 is pressed to prompt, but only one can be filled at a time. If both are filled an error message should appear saying this is invalid. Can someone tell me how to create a command like this? What do I need to specify in the CMD source to achieve it?</p>