If you mistakenly entered an incorrect IBAN number or the wrong recipient's name, this may in some cases be detected by the receiving bank. Their system might notice that the recipient's name and the IBAN number do not match, and they will therefore reject the payment and return it, charging a fee for this action.
If the entered IBAN number is valid, the payment will usually be processed to the specified IBAN number. Unfortunately, it is not possible to force returns of international payments. The sending bank can request a return, after which the receiving bank will contact the recipient and ask if they accept the payment being returned.
Remember: When you send money abroad, it is your responsibility to ensure that all details are correct.