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UK requirements (from this interesting thread. We should check if OFBiz is OK, I guess so but maybe some quirks)
VAT invoices must show:

•   an identifying number;
•   your name, address and VAT registration number;
•   the time of supply (tax point);
•   date of issue (if different to the time of supply);
•   your customer's name (or trading name) and address;
•   the type of supply (see 16.3.2 below); and
•   a description which identifies the goods or services supplied.

For each description, you must show:

•   the quantity of goods or extent of the services;
•   the charge made, excluding VAT;
•   the rate of VAT;
•   the total charge made, excluding VAT;
•   the rate of any cash discount offered;
•   each rate of VAT charged and the amount of VAT charged at each rate and shown in sterling; and
•   the total amount of VAT charged, shown in sterling.
  It seems that for most UE coutries (at least UK, France and Italy) it's not mandatory to calculate VAT for each item but for each existing rate in the invoice.

France requirements

• An unique bill number based on a chronological and continuous sequence,
• the complete names of salesman and customer with respective addresses,
• the individual number of identification to the VAT of the salesman and customer (the number of VAT of the customer remains optional for operations realised in France),
• the date back to delivery or bill transmission.

On each  invoice line you must show

• The realisation date of the sale/service or deposit payment,
• for each of the delivered goods or services: quantity, name, VAT excluded unitary price, VAT rate or, if needed, exemption,
• all reductions, handing-over, rebates or discount obtained and calculable at the time of the operation and directly linked to this operation.

Finally, must be shown

• The tax amount to pay and, by rate, VAT excluded total and corresponding tax (If the liable is brought to bill another VAT that the French VAT, she/he must specify very clearly that it is a tax of such or such foreign country).
• If need be, a mention indicating that the operation benefits from a measure of exemption (with law reference), or of an auto-liquidation or profitable margin system.
• The date at which the payment must take place,
• the rate of the payable penalties begining the day following the date at which the payment must take place,
• discount conditions.
  

  Requirements by region

France VAT link there are many other languages links from this link, very interesting
Eu VAT specificities change language if you need

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