I did some research on them before picking.
They were at Barca together as well as Holland.
They didn't play years together, but they certainly played together, so we're a partnership.
They were together for one season at Barca, Overmar's final and injury plagued one before retirement, where he mostly warming the bench (when healthy) as there was a certain Ronaldinho playing on the left. If you think that constitutes a partnership good for you.
They barely played together for Netherlands as I already told you, and the fact that you had to do "research" shows that you probably didn't had a good recollection of them playing together, which is understandable as they barely did. Just because they were on the same squads doesn't mean they were on the pitch together, let alone form a partnership.
Look mate, I'm fine with you picking whatever partnership you want, this is supposedly to be fun after all, but I find it ironic to read you complaining about "real" partnerships when you picked such a stretch of one in your team.