Possible Clues:

• Board requiring approval from different parts of the EU
• European agreements board claimed to hear from the other side
• Board whose name combines two words for "yes"
• Type of board used with a planchette
• Kind of board with letters printed on it
• Spiritualist's table
• Board with four vowels
• Board has approval in French and German
• Message board of a sort
• Board used in conjunction with a planchette