i remember reading about this when PES4 first came out and people were trying to figure out how to do the rabona shot. (oh yah, it's only a shot. can't do it as a cross, famously done by cronaldo.)
anyway, one high-chance method of doing it is this way.
assuming you're using a left-footer like Recoba, don't sprint, just run normally. approaching the RIGHT side of the goal (as seen from Recoba's point of view), do a side-step to the left, then a step forward followed by a shot to the far-side.
it worked quite a few times for me on PES4, dunno whether it'll work as well in PES5.