The Netherlands

Your sales or purchase invoices must require the following data;

• the name and address of the supplier
• the VAT identification number of the supplier
• your name and address
• the invoice number
• the invoice date
• the date on which the goods or services were supplied
• the quantity and type of goods supplied
• the nature and type of services supplied

Invoices must also include the following data for every VAT tariff or exemption:

• the price per piece or unit, excluding VAT
• the VAT tariff that has been applied (0% - 6% - 21%)
• the cost (the price excluding VAT)
• in case of advance payment: the date of payment, if this is different from the invoice date
• the amount of VAT
In some cases your VAT identification number must also be included on the invoice.
This is the case for export of goods to other EU countries and for certain services involved thereby, such as transport services.
Your VAT identification number must also be included on the invoice in cases of reverse-charging.

Reverse-charging:

The “reverse charge mechanism” is a system that is applicable for all business-to-business purchase and sales within the EU,
and allows your suppliers to charge 0% VAT on their services/goods, in stead of charging VAT from their home country.
In order to apply this, the requirements are that both VAT number form you and the supplier must be mentioned on the invoice, plus mentioning “VAT reversed charges”.

http://www.vatlive.com/eu-vat-rules/reverse-charge-on-eu-vat/