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Product Storages

This table is used within the Network Optimization experiment only. It allows you to define the inventory stock parameters.

Product(s) will not be shipped to/from a site (e.g. of DC type) unless the corresponding product storage record is defined in this table.

The defined record with inventory parameters will not be considered if at least one of the expanding toggle buttons ( Expand Facilities, Expand Products, Expand Periods) is disabled in it. If you require to keep the toggle button disabled for this record, you should duplicate it, enable the toggle button and make sure that no limit is set for the stock ( Min Stock, Max Stock).

The Expand periods toggle-button defines if the specified stock level is required at the end of each period (Enabled) or at the end of the whole period (Disabled). For more details refer here.

Column Description

Label

Specify the name of the storage constraint.

It must be a meaningful name since you will refer to it in the Custom constraints tables.

Facility

Defines the site that the constraints will be defined for (DC, Factory, Supplier and groups containing them).

Double-click the cell and select the required facility from the drop-down list.

Expand Facilities

Defines if the specified stock level (columns from Initial stock, units to Fixed Value) is applied to each defined facility (Enabled) or to the aggregated number of facilities (Disabled). By default the aggregated number of facilities is considered.

e.g. We specify a group of 4 DCs. The Min Stock value is set to 55 items. If the Expand Facilities is enabled, the specified amount of products is considered to be stored at each DC, totaling 55 * 4 = 220 items, otherwise it will refer to the sum of products stored at all DCs.

Product

Defines the product or a group of products.

Expand Products

Defines if the specified stock level (columns from Initial stock, units to Fixed Value) is applied to each defined product (Enabled) or to the aggregated number of products (Disabled). By default the aggregated number of products is considered.

e.g. A site offers 2 types of products. The Min Stock value is set to 55 items. If the Expand Products is enabled, the 55 items will refer to each type of a product, totaling 110 items, otherwise it will refer to the sum of all products.

Initial Stock, units

Defines the initial stock of the specified facility/group of facilities.

Min Stock

Defines the lowest stock level of the specified facility/group of facilities.

If the Understock Penalty is set to 0, this will be a hard constraint.

Safety Stock

Defines the safety stock level of the specified facility/group of facilities.

If the Safety Stock Penalty is set to 0, this will still be a soft constraint.
The hard constraint is not available for the Safety Stock.

Max Stock

Defines the highest stock level of the specified facility/group of facilities.

If the Overstock Penalty is set to 0, this will be a hard constraint.

Fixed

If enabled, the Fixed Value column is considered.

Fixed Value

Allows you to explicitly specify the stock level of the facility/group of facilities.

Understock Penalty

Defines the penalty to be paid per product item (or per cubic meter) for dropping the stock level below the specified Min Stock level.

The penalty is calculated as: specified penalty * sum of the lacking products.

If the penalty is set to 0, the specified Min Stock will be considered as a hard constraint, i.e., it cannot be violated. For more information refer here.

Safety Stock Penalty

Defines the penalty to be paid per product item (or per cubic meter) for dropping the stock level below the specified Safety Stock level.

The penalty is calculated as: specified penalty * sum of the lacking products.

This is a soft penalty, i.e. the specified Safety Stock can be violated, and the default value (0) is the price to be paid per product item as a penalty.
The hard constraint is not available for the defined Safety Stock.

Follow the link to find more information on the constraints.

Overstock Penalty

Defines the penalty to be paid per product item (or per cubic meter) for exceeding the stock level specified in Max Stock level.

The penalty is calculated as: specified penalty * sum of the excessive products.

If the penalty is set to 0, the specified Max Stock will be considered as a hard constraint, i.e., it cannot be violated. For more information refer here.

Currency

The type of currency in which the penalties are expressed.

Product Unit

Specify the unit (of weight or volume) the product is measured in. The list of available units contains all the units that are currently used within the project as well as the units defined in the Units table that can be used in the current scenario only.

Time Period

The time period during which the constraints are valid.

Double-click the corresponding row cell to choose among the available periods (previously defined in the Periods table).

Expand Periods

Defines if the specified stock level (columns from Initial stock, units to Fixed Value) is required at the end of each period (Enabled) or at the end of the whole period that the group of periods forms (Disabled). By default the whole period is considered.

e.g. We have a group of 4 periods. The Min Stock value is set to 55 items. If the Expand Periods is enabled, the specified amount of products is required at the end of each period, totaling 55 * 4 = 220 items, otherwise it will refer to the end of the last period of the group.

Inclusion Type

Defines the status of the current facility constraint.

  • Include — if this status is set, the facility constraint will be included into the supply chain configuration.
  • Exclude — if set, the facility constraint will be excluded from the supply chain configuration. If selected, the table record will be grayed out to denote the current inclusion type. The table record stays editable.

    If you feel that your scenario contains too many objects marked as "Excluded" and you know that you no longer use them, you can instantly remove all such objects.

Defining inventory stock parameters

You can define the following:

  • Product(s) that this or that facility/group of facilities works with.
  • Stock constraints that must be applied to a facility/group of facilities (valid within the specified period of time).
  • Penalties for violating the specified constraints.

The table allows you to consider the stock parameters for:

  • One site, each site of the group, sum of all sites of the group specified in the Facility column.
  • One product, each product of the group, sum of all products of the group specified in the Products column.

You may alter these combinations by clicking the toggle buttons in the Expand Facilities, Expand Products columns.

By default the stock is measured in items but when the following condition are met, the units automatically switch to cubic meters:

  • At least one of the Expand Facilities, Expand Products is disabled.
  • The group of facilities/products contain more than 1 site/product.

    The data in the columns will not be converted to the new measurement units. The same numbers will be expressed in cubic meters now.

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