Hey, Anton, first congratuation to you. I wish that day would n't that far for me.
Thanks. You posted a new question to me. that is leading zero. So far, I treat owner, as well as other field, as
string. so leading zero is significant.
So, you mean, in client side, I should take booking literally if following instruction strictly. Unbooking is not part of booking. Therefore, I shouldn't allow a blank input for booking a non-blank owner (ie unbooking). Yes, you are right that sun doesn't require unbook in gui, but it requires to record a owner id as it is, which confused me of when the input is blank.