How is the currency for Statistical value for foreign trade determined?

How is the currency (EIPO-GRWCU) for (Statistical worth for overseas trade) for EIKP-GRWR determined?

In our income documents and invoices erstwhile we look astatine the Conditions we ever see GRWR successful EUR. However connected the export information (EIKP/EIPO) it's converted to CHF.

We privation this worth successful EIPO to beryllium successful the section (document) currency (EUR).