A typical scenario for production at multiple sites might involve an end item that comprises component items, where the component items are produced at and moved between different sites, and the sites share common item numbers.

This scenario requires that the bills of material (BOM) versions for the component items are structured to support the mandatory site dimension. The warehouse operations that support material consumption and item storage must also be aligned by site.

When planning materials and resources in an environment with multiple production sites, the program selects the BOM version to use based on the site of the requirement, a valid date interval, and the quantity.

These are the rules that apply for BOM versions and BOM lines in the Linesform and the Designerform.

• A BOM version can only span one site, and all BOM lines must be associated with the same site that is defined on the corresponding BOM version.

• A BOM can have a blank site, in which case, the BOM can be used at more than one site.

• If a BOM version does not specify a site, the warehouse field on the corresponding BOM lines must also be blank.

• If the site on a BOM version is changed, the site on the BOM lines is also changed, and the warehouse is cleared.

• The warehouse lookup on BOM lines is filtered by the site.

• When you select the work center consumption field on a BOM line, the warehouse is cleared. In this case, the picking warehouse is found through the route, by locating the warehouse that is assigned to the production unit that the work center belongs to.

  This validation occurs at run time when the production BOM is created. An inconsistency results in the production order not being created.

• If no warehouse is entered on the BOM line, and the work center consumption is not selected, then the warehouse is found through the site-specific settings on the item master. If no warehouse is entered on the item master, then the warehouse field is left blank.

  This validation occurs at run time when the production BOM is created. An inconsistency results in the production order not being created.

• If a site is entered on the BOM version, and a warehouse is entered on the BOM line, if the user selects the work center consumption field, the warehouse field is cleared.

  If during run time, no warehouse is found for the work center, then the warehouse is found through the site-specific settings on the item master. If no warehouse is entered on the item master, then the warehouse field is left blank.