Hi,
not the correct section, as it is not an EWM question, but anyway...
The Stock Placement block is what is called Putaway Block a little bit lower on this screen. So stock placement is that you put something INTO the bin, stock removal is that you PICK from the bin.
With the selection indicators you select what bins shall be displayed on the next screen where you then set or remove the blocking indicator. Now you want for example REMOVE a block, why would select ALL bins, you only need the ones with have a putaway or stock removal block set. Otherwise, you want to SET a block you would only select NOT blocked bins.
Brgds
Juergen
---
Want to learn EWM?
Check for EWM courses @ https://training.sap.com/curriculum/scm_ewm
Get a SAP Learning Hub Subscription: https://training.sap.com/shop/learninghub