Mandatory attribute. Use BT-5
EUR| Identifier/Error message | Flag | 
|---|---|
| PEPPOL-EN16931-CL007 Currency code must be according to ISO 4217:2005  | 
            fatal | 
| PEPPOL-EN16931-R051 All currencyID attributes must have the same value as the invoice currency code (BT-5), except for the invoice total VAT amount in accounting currency (BT-111).  | 
            fatal |