If you've ever been to a product page in Distru, you'll likely have seen something like this under the "Inventory Tab":
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If your page doesn't look exactly like this: These statuses may vary depending on the product.

Let's break down what each of these mean, so you can have a better understanding of your product inventory in Distru!
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This is inventory that is sitting around and ready to be used. Active inventory of a product is the sum of its active packages. A package is active until it is:

In other words, active inventory is how many 'Active' packages you have (which should also be the packages that are available in the Active tab in Metrc > Packages). If you run an Inventory Valuation report, it will show your active inventory also (along with your available inventory).

Also if you have any 'Finished' or 'Discontinued' packages that have inventory, they will contribute to Active inventory.

This is inventory of a product that is still available to be reserved for on a sales order. This is calculated by subtracting the reserved inventory from the active inventory of a product.

This is inventory of a product that has been consumed by one or more Assemblies.

This is inventory of a batch-tracked or package-tracked product that has been reserved for sale, but not actually taken out of active inventory. A product's reserved inventory is the sum of inventory that is:

These numbers are available, no pun intended, in the Inventory Valuation report.

This is when an active package is assigned to a line item in a sales order 

This is inventory of a product that was first selling, and then was subsequently transferred, and then the SO was matched to a transfer (and thus completed). This is calculated by summing up the inventory of "Completed" sales order that include this product. 

In other words, if a package was never selling but was transferred it will stay transferred. If it was selling first by being assigned to a line item in an SO and then was transferred and then the SO was matched, it would be sold .

This is inventory of a product that has been brought into Distru through a purchase order. This is calculated by summing up the inventory of "Completed" purchase orders that include this product.

This is inventory of a product that has been adjusted in Distru with the reason "waste".
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Lets walk through an example to help you better understand how these statuses change over the course of a scenario:

A package of 100 Units (P1) is in Inventory, no orders.

50 Units are added as a line item to a Sales Order #001, without METRC packages assigned

New package of 50 units (P2) is made by splitting P1

P2 is assigned to line item with 50 units in Sales Order #001