Sourcing rules assigned to models are used during the planning of the model forecast, and during ATP of a model sales order. These same rules are used during autocreate configuration to determine the correct sourcing for the configured item. Once the configuration item is created, its sourcing rules are used for all planning and execution.

Option Specific Sourcing (OSS)
Option specific sourcing allows you to restrict the sourcing of a configuration based on a specific option or options that are ordered. For example, you may have a model that can be manufactured in three organizations. But if a specific option is chosen, it can be made only in one of the three, as they have the specialized machinery to build it.
If you have restricted options, specify the list of valid organizations and vendors where the model can be manufactured, stocked, transferred or procured, if that option is chosen. This list of organizations is overlaid with the model sourcing chain, during the ATP and Autocreate configurations processes, to restrict the sourcing of a specific configuration based on the options that were chosen.

This section is intended to give you a feel for situations in which you may need to setup  option specific sourcing for your models:
OSS setup is notrequired
There are three organizations, set according to regions of the world:
• Japan Org
• US Org
• Europe Org
The model is a Make item in all three, but the BOM in each is different, and contains only options pertinent to its respective region.
For previous releases, you manually chose the warehouse on the sales order based on where the order originated (or used OM defaulting rules to do so). In this case, CTO creates the BOM only in the org against which the order is placed. This is still true if the model's Create Configuration Item, BOM attribute is set to Based on Sourcing (the default). No further set up is required.

You can use this attribute even if you are doing PDS based ATP with matching, because the ship from organization is always defaulted, and there is no variation in sourcing once that organization is picked. No OSS setup is required. OSS setupis required The ATO model can be made in any of six manufacturing organizations, and you want the choice of the manufacturing organization to be based on GOP, rather then simple defaulting rules. However, if the customer chooses a specific option (for example a specific specialty coating for the product) it can only be made in Org1. Match is used on this model.

For 12.0, if you want to use GOP to pick the warehouse or want to match during ATP, the model's Create Configuration Item, BOM attribute must be set to Based on Model so that the item, BOM, and routing are created in all six manufacturing organizations, and future matches to the configuration item are valid and ATPable in all six manufacturing organizations.
If you do not set up OSS for the model with the specialty coating, CTO attempts to create the bill for these configurations in all six organizations no matter which one is shipping the material. Because the speciality coating option does not exist on the model BOMs in organizations 2-5, autocreate configuration completes with a warning and puts the order on hold for all sales orders with this option.

To avoid this, set up OSS for the Model with the specialty coating as a component to restrict ATP to choose only Org 1, and to restrict the BOM creation for that item to Org1. This is required even if you are not using ATP or APS.