SAP PI: Problem when using mapping function

[Former Member]

In Message Mapping there is the button to expand link between sourc and target message.

But in my system this button is disable... so how can I enable this button

expert please tell me,

Best Regards,

@tom

[Former Member]

Do you refer to this one?

Are there any fields mapped in your mapping? If not, try to map any field, maybe the button is available then.