From a responsible gambling point of view you shouldn't be able to reverse a withdraw request. Then you're gambling away your winnings and aren't "happy" until you're broke....
If you put in a deposit limit on a site, then it takes a week before you can raise that limit, reversing a withdraw is more or less a new deposit of that sum but casinos don't see it that way as if you reverse it they don't have to pay it out.....
As an example, if you deposit 100 euro on a site, you win up to 1000 euro, you withdraw 900 euro and continue to play with the 100 remaining euro.
You loose those 100 euro, now if you reverse your winning, it's like you would make a new deposit of 900 euro and here we come to serious RP issues, now you're starting to chase your losses (sure, you're 800 euro up).
But think about it, you are (depositing) reversing 900 euro to chase your loss of the initial 100 euro that you just lost.... so if a casino takes RP seriously then you shouldn't be able to reverse a withdraw request.