Tryton module for stock and inventory
Project description
The stock module defines fundamentals for all stock management situations: Locations where products are stored, moves between these locations, shipments for product arrivals and departures and inventory to control and update stock levels.
Location
Locations are generic places where products are physically or virtually stored. The following location types are defined:
Storage
Storage locations define real places where products are stored.
Warehouse
Warehouses are meta-locations which define input, storage, picking, output ,lost and found and waste locations. These locations are all of type Storage. Input and Output are locations where incoming an outgoing product are temporally stored awaiting transportation. The storage location is often the biggest location where products are stored for middle or long periods of time. The picking location is optionally where the products are picked by the customer shipment otherwise the storage location is used. The lost and found location is the location used by inventories when correcting stock levels. Waste locations are used to throw away wrong products entering the warehouse.
Customer
Customer locations are virtual locations accumulating products that have been sent to customers.
Supplier
Supplier locations are virtual locations accumulating products that have been received from suppliers.
Lost And Found
Lost And Found locations collects inventory gaps. See :ref:inventory for details.
Drop
Drop locations are virtual locations used as intermediary locations in the process of drop shipping.
Production
Production locations are used during the production of products.
View
View locations are virtual locations that can be used to logically group other location types.
Locations are organised in tree structures, allowing to define fine grained structures. It is possible to restrict a location to have only one level of children, this allows to improve the performance of the stock quantity computation.
Location Lead Time
It allows to define the time needed for an Internal Shipment between two warehouses.
Move
A move is a movement of a product in a given quantity between two locations. It may eventually defines a unit price and a currency for the products that are moved from or to another company, allowing to compute stock value at any time (and to update the cost prices if the chosen cost price method is Average). A move also defines a planned date (when one plan to do the move) and an effective date (when the move is actually made). Products that are used in stock move must of of type Goods or Assets. Stock levels are ignored for consumable, this means that they can be always assigned. Service products are ignored by the stock module.
A move can be in one of this states:
Draft
The initial state, used when the move is created and to define future stock movement that are planned, but still subject to modifications.
Assigned
An assigned move allow to reserve some products. Thus preventing other user to assign them.
Done
The move is in state Done when the real movement is made.
Cancelled
A cancelled move will be ignored by the system. Only Draft or Assigned move can be cancelled. To revert a move in state Done, an opposite move must be created.
Staging
A phantom state used to create in advance move that should not be taken for stock computation.
A cron task runs every day and recomputes the cost price of moves if a past unit price has changed.
Product Quantities
Product quantities on each location are the sum of all moves coming from or going to this location. For quantities that are computed for a date in the past, only confirmed moves (i.e. in state Done) with an effective date inferior to the considered date are taken into account, reflecting the real situation. For future quantities, Draft and Assigned move with a planned date greater than today and smaller than the given date are also summed.
Shipment
A Shipment define a group of moves happening at the same date and around the same location.
Supplier Shipment
A supplier shipment is used when products are received from a supplier. It is mainly composed of a party (the supplier), a location (the warehouse in which the products are coming) and two list of moves:
Incoming moves
The moves between the supplier location and the input location (as defined on the warehouse).
Inventory moves
The inventory moves are between the input location and the storage location (or one of his child locations).
If the storage location is configured as the same as the input location only incoming moves are created.
The supplier shipment can be in one of this states:
Draft
Incoming moves and inventory moves (if they exist) are in draft.
Received
Incoming move are set in state Done, inventory moves are created if necessary.
Done
Inventory and incoming moves are in state Done.
Cancelled
All moves are cancelled.
Customer Shipment
A customer shipment is used for sending products to customer. It is mainly composed of a party (the customer), a location (the warehouse out of which the product are going) and two list of moves:
Inventory moves
The moves between the picking or storage location and the output location of the warehouse
Outgoing moves
The moves between the output location of the warehouse and a customer location.
If the picking or storage location is configured as the same as the output location, then only outgoing moves are created and no assignation is done.
The customer shipment can be in one of this states:
Draft
Outgoing moves and inventory moves (if they exist) are in draft.
Waiting
When a customer shipment is set to waiting, the inventory moves are created (or completed) to balance the outgoing moves. The waiting state also means that the shipment should be processed.
Assigned
The assigned state is when products have been assigned (or reserved) from the storage locations.
Packed
The packed state is when the inventory moves have been made, i.e when the products have been physically moved to the outgoing locations.
Done
The shipment is Done when the outgoing moves have been made, e.g. when a truck left the warehouse.
Cancelled
A shipment which is not yet completed (not in state Done) can be cancelled at any time. This also cancels all the moves.
Rescheduling Customer Shipments
It is possible to setup a cron task to reschedule customer shipments that are planned for the past. By default they are rescheduled to today.
Internal Shipment
An internal shipment is used for sending products across locations inside the company. It is mainly composed of two locations and a list of moves. It can be in one of these states:
Draft
The moves (if they exist) are in draft.
Waiting
The waiting state means that the shipment should be processed.
Assigned
The assigned state is when products have been assigned.
Done
The shipment is Done when the moves have been made.
Cancelled
A shipment which is not yet completed (not in state Done) can be cancelled at any time. This also cancels all the moves.
Rescheduling Internal Shipments
It is possible to setup a cron task to reschedule internal shipments that are planned for the past. By default they are rescheduled to today.
Inventory
Inventories allow to control and update stock levels. They are mainly composed of the inventoried storage location and a list of inventory lines. Inventory lines consist of a product and it’s default unit of measure, an expected quantity and the real quantity (the real products on the shelves).
A button allows to auto-complete inventory lines with respect to the expected quantities for each product in the location. Another button allows to launch a wizard to count products by adding the quantity to the existing matching line.
When the inventory is confirmed, moves are created to balance expected quantities and real ones.
Product
The cost price of a product can only be modified using the “Modify Cost Price” wizard once it is associated with stock moves. The wizard stores, for each template or product the cost price revision. This revision contains a formula that compute the new cost price based on the current one. E.g. cost_price * 0.9 to reduce the cost price by 10%. The cost price revisions are applied at the beginning of the stored date when the cost price of a product is re-computed.
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