You need to manually track inventory costs through a manual process, but you cannot track costs of inventory in and out of the warehouse at different costs or change cost methods.
It is difficult for you to track in other ways than individual items, such as grouping them together as lots or kits, or multiple configurations. You need to track by serial number and are unable to assign individual units of measure.
You have to wait until the order is filled and then manually update inventory. That gives an inaccurate picture of inventory levels.
You have to manually provide updates/transactions to inventory items when items are purchased, received or returned. That gives an inaccurate picture of inventory levels.
You manually track orders and it is difficult to process back orders. You need to wait until the stock is replenished and then manually enter the order at that time. It is difficult to keep track of which customers still need orders filled.
Too much of your inventory is inaccurate and it is difficult to determine what to purchase. You do not do a physical cycle count often enough, and the delta between actual inventory is too high of a percentage. The system says you have something that you don’t too often.
You do not know when you are getting low on inventory, so you run out of stock often and this has a negative impact.