I have applied from Germany and I have to show the required proof of funds by 17th April, does it really hurt my chances if i show the required proof for certain time, as i am only working for the last few months i dont have enough reserves and i would like to borrow it from a friend for some time and show the funds in my account, ideally how long should one keep the funds in the account and is just a letter from my bank stating that i have XYZ $ on XXX date is enough..