Field exit for checking if tax number is unical in vendor master.

Hi,
is there a field exit that checks if tax number is unical in vendor master?
Best regards

Swamy,
As you've pointed out, you already know that path. I'd recommend stating all that you've already tried and ruled out while posting a query here. It'll help people putting in effort that won't be helpful to you.
Coming back to your query, there is obviously no way to introduce email ID as a sensitive field. However, there's nothing stopping you from using a little creativity here. This solution is not exactly direct, but I believe it is achievable. Here are your components:
Have a look at enhancement SAPMF02K (t.code SMOD). Look at the component FM - EXIT_SAPMF02K_001.
From table LFA1, get LFA1-ADRNR. Go to table ADR6 (SMTP Numbers (Business Address Services)).
In ADR6, field SMTP_ADDR is email ID.
You can designate a field you don't currently use as always = email ID field content on vendor master screen. This proxy field can get it's value inside the user exit I've mentioned above, and you can find the email ID using the logic I've mentioned above. Ensure that this proxy field can be designated a sensitive field. That's it!
Now, everytime a user changes the email ID, your proxy field gets changed, and thus invokes the Senstive Field rule.
I've not used this myself, but believe it should work.
Remember to assign points if found useful.
Regards
Gulshan

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