Hi Jay,
Happy New Year!
I have checked the above scenario.
It is not possible to have more that one exemption certificate for single tax type.
There is only one case where we can have different exemption certificate applicable to same tax type - in case of different business place.
--> Business place may be the head office or branch or regional offices, etc which might have different TAN. While posting transaction business place must be entered to ensure that correct exemption certificate is applied.
But in this case while posting the document you will only be allowed to have one exemption certificate applicable as per the business place.
Request you to check the below link for details on WHT setup and use of exemption certificates.
Do let us know if you still have open issues on the same.
Thanks,
Vishal