State the reason for why the following schema not in $2$NF$.$ Normalize to $2$NF Sales $($SalesID$,$ ProductID, ProductName, SaleDate, CustomerID, CustomerName, Amount$)$ Functional Dependencies: ProductID ProductName CustomerID CustomerName SalesID SaleDate, Amount $($SalesID$,$ ProductID$)$ Amount $($assuming sales amount may depend on product and sale transaction$)$