You might see this error during a CSV import:
Error in the mapping:
Price including VAT found in CSV column but no VAT column found. You need to indicate the VAT or use only price excluding VAT
Price including VAT implies a VAT rule, hence the need to select the VAT field when using priceinctax field in your CSV import.
If you are not using any VAT, simply use priceexctax field for your imports.
The price excluding VAT will also be automatically added to the price including VAT field.