The plus icon represents a purchase Transaction. This means materials or products have been ordered and are currently pending arrival at the Warehouse. (Pending action). This action appears green on the list.
The minus icon indicates that materials have been removed from the Warehouse for reasons other than manufacturing, such as testing, maintenance, or internal use. (Withdrawl action). This action appears in red on the list.
The list icon shows that materials or products have been received into the Warehouse, whether they were produced in-house or purchased from an external supplier. This action appears in blue on the list.