[A] If the items in your inventory master are highlighted with colors as shown below, then let me tell you each color comes with a message.
[B] First yellow highlighted item means that your inventory for that item is below the minimum stock level.
[C] Second light red highlighted items mean that inventory for those items is negative in the system. Inventory for those products is gone below "0".
[D] Third dark red highlighted items mean that inventory for those items has crossed the maximum stock level.
Keywords - items are red highlighted, why color showing on items