When you enter BTC3 as the amount for transaction,it will ask you to put some fee that is 0.0001 or lower/higher as the service fee for that transaction including escrow fees. So you will need to put the amount as BTC3.00001 depending accordingly to process the transaction.Also , apologize to Danny,I know not everyone can speak in English but I'm sure no matter which place you come from you have some Ethics to follow.