End check box in Picking list Journal in a Production Order

Hi Experts,

What is the purpose of 'End' check box in picking list journal. I thought if we check the "end" box for an Item and post it, we won't be able to generate additional picking list journal for the same Item in the same production order but when I tested it, it is allowing me to create a new journal.

Please clarify the purpose of "End" check box and its usage. 

Thanks in advance.