In their guidance, the European Commission has proposed that Mill Test Certificate [MTCs] may be considered as sufficient evidence however, customs authorities may require any additional evidence for the different transformation steps which the product has gone under. What constitutes sufficient evidence is always decided by the respective customs authority, in some cases the customs authorities require the presentation of several pieces of evidence to demonstrate compliance.

Some examples of additional documentation that could be requested are:

• invoices
• delivery bills
• quality certificates
• long-term supplier declarations
• calculation and production documents
• customs documents of the exporting country
• business correspondence
• production descriptions
• declarations of the manufacturer or exclusion clauses in purchase contracts, which show the non-Russian origin of the primary products