Hello  dear colleagues. 

We have in our Project the following Situation:
Customer is having an issue in triangular transaction. As stated in the intrastat guide in intra community triangular transaction, the VAT number of the recipient of the goods must be entered into the intrastat line. Not the VAT number of the invoiced customer!!! 
However IFS always enters the VAT number of the invoice address/invoiced customer into the intrastat line. 

Furthermore, if the VAT number of the recipient of the goods is unknown, then the country code of the invoiced customer + 12x the number 9 must be entered 
(e. g. FR999999999999). Also, in the intrastat line, the checkbox for Triangulation is not set to True. 
I think some settings are missing, and this issue could not be solved by our support. It seems like this logic is not yet implemented in IFS.

As a workaround this can be handled by doing manual updates on the Intrastat lines to assign the Opponent Tax ID that is referring the recipient of the goods, 
if the value collected by Intrastat is not the expected one, before submitting the Intrastat to the authorities.

I hope the legal requirements are clear and important enough for next enhancements in near future.
Thank you very much. For any questions, experience and comments I will be very thankful.
Best regards,
Maxim