Creating app that allows customer to add product to cart

Hi guys,   I tried to create a shopping app for education purpose, but my microflow is not working, I added a breakpoint in microflow and it showed my retrieve object is not working. what should I do to fix this problem? This is my microflow and domain model
1 answers

If the shopping card is not committed to database yet, you can only retrieve it over association (currently you're retrieving from database).