How to implement validations in message mapping?

Hi experts,
I have a simple requirement:
I have a simple synchronous scenario:
SOAP -> XI -> RFC
In a message mapping, one of the fields in the source message is of type String.
However, the target application (RFC) does not expect a non-numeric characters in this string.
My question is how can I perform the validation in XI and tell the sender that this field contains Non-numeric characters?
Please help.
Thanks.
Ron

> Ron,
>
> >>With a RunTime Exception thrown, how can I tell
> the sender an error has occured?
>
> Sure. You can do this with out a BPM. You need to
> configure alerts for this. If you configure ALERTS
> and SCOTT, this will send an email of the errors
> occuring in your scenario.
>
> For configuring and trouble shooting alerts check
> these
>
> https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/
> 2327
> https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/
> 2328
>
> Regards,
> Jai Shankar
Hi Jai
I already have alerts configured.
But what I had in mind is to send a response to the sender (The sender is waiting for a reply since this is synchronous), instead of telling the sender through an alternative means such as email, sms, etc.
Is this possible?

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How to implement validations in message mapping?

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