Order missing product alert

[mastcorp]

Good evening, We have created a warehouse management application that works with orders for export of products! During the order the products of the order will appear and I will scan the products, whenever I will pass them successfully, but if I have not passed a product to order, I would like to create a condition that notifies me if I miss a product that I do not have scanning! Please help me find the right condition!

[Joseph_Seddik]

IN() - AppSheet Help 

[mastcorp]

I USE  this condition but doesn't work , 

IN([ORDER LIST], LIST(PRODUCT,QUANTITY) = IN([SALES], LIST(PRODUCT, QUANTITY))  

Please help me