The UID number is a standard field in SAP Business One.
In addition to submitting the recapitulative statement, claiming the tax exemption for intra-Community supplies requires a valid VAT identification number of the business partner in an EU country. If you do not have a valid VAT identification number of the partner at the time of the delivery or service, the delivery or service is subject to VAT!
You also face a fine of up to 5,000 ? ( 26a UStG).
With the add-on Versino Financial Suite you can validate the business partner's UID number directly from SAP Business One.

DATEV functions of the Versino Financial Suite
What is the difference between the SAP DATEV interface and the DATEV functions of the Versino Financial Suite? Companies that use SAP Business One ...

SAP Business One and DATEV - Synchronised
The development of the Versino Financial Suite began several years ago as an interface to the DATEV financial system. Initially, we implemented a ...

DATEV and SAP Business One Export & Import
The export and import of data between DATEV and SAP Business One was a major issue with the increasing spread of SAP B1 ...

Versino Financial Suite (DATEV ADDON) – More than you think
Initially "only" a bidirectional interface to DATEV finance was planned. But when we talked about this development with more and more ...

VERSINO DATEV Interface/ Financial Suite HANA ready
At the beginning of the development, as the name Versino DATEV interface suggests, one goal was in focus: the transfer and receipt ...

New functions for the Versino DATEV ADDON
The Versino DATEV ADDON is getting more and more new functions. These have long since gone beyond exporting and importing data between ...