Creating app that allows customer to add product to cart

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

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