Couple question regarding pick list

Hi

I have several questions when I using pick list module.
First, when I create the pick list from work order, the item locations table listed the items mentioned in work order which actually come from BOM
I don’t know the exactly meaning between Qty stock Qty and Picked Qty.
In my snapshot
image
Column Qty , Column Stock Qty and Picked Qty seems all same.
In my understanding,
Qty = How many I need in this work order
Stock Qty = How many I have total in warehouse
Picked Qty = if amount of stock qty is less than qty, how many I can use for pick, normally equal stock qty.
Please correct me if I’m wrong.

Second, if system told me some of items don’t match the requirement like this.
image
How can I quickly create the material request form?
Right now I need to write down the item code, create the MR form manually. I mean the whole process is manually, I may make mistake like inserted wrong item code in MR form.
So is there a way that unmatched item can be listed in new MR ( Material Request ) automatically ?

Thank You