Steps to reproduce in Ibexa Commerce v3.3.15 :

• create one product
• add customer price to new product (see: price-upload-1.png)
• download price list (admin ui -> e-commerce ->Price and stock management)
• upload same price list that was just downloaded (see: price-upload-2.png)

Result:
Error Message is shown
Parameter 'currency_list' with namespace '' could not be found. Tried scopes: siso_core