What is the purpose of the 'stopped' checkbox and 'complete' checkbox in the purchase line detail ?

In the general tab, we found the ‘stopped’ checkbox and ‘complete’ checkbox.

What is the purpose of that checkbox ?

Can we use that one to stop that PO at receipt status only ( invoice is not allowed ) ??

Stopped stops it where it is, will prevent further receipt or invoice.

Complete means you need to book it all in in one go.