Thanks!
Yes, its quite difficult, and fails most of the times.
A short guide for ppl who want to know how to perform it:
Try to aim at the far corner and just between 2 defenders. Shoot with O (long pass button) while holding down-button till the power-bar is full and then pray at least on of the defenders will jump up and the keeper is too late (the latter is often the case with FK takers like RC or Adriano, if you dont have a normal FK specialist, you can select someone with high shot power and try this version of a FK, but only <24m)