TakePOS purchase, warehouse stock decrasing

Hello!
I have problem with takePos on dolibarr 13.0
I have products on warehouse, lets say coffe latte, and black coffe…When I purchase(sold) them by takePos terminal, the cash is addedet to my bank account but stock quantity on my warehouse is not decreasing.
What i shoud do, looks like everthing is configured as it should be.

Thanks