PTC FlexPLM Fundamentals > Line Sheet Management > Working with Primary Materials > Setting a Primary Material within a BOM
  
Setting a Primary Material within a BOM
After identifying a primary specification for a season, and a primary BOM for the specification, you can select the primary material within the BOM editor. Choosing a primary material in the primary BOM for the primary specification for the season allows the material to appear in the season line sheet.
To select a primary material from the BOM editor:
1. Select a row in the BOM that has the material you want to use as the primary material for the BOM.
* 
The material might exist on more than one line in the BOM. You only need to set it on one line.
2. Select the appropriate material from the material library or the text list.
3. Click the actions icon and select Set As Primary to establish the primary material for the BOM.
To clear a primary material, select Set As Primary for a BOM row that does not contain a material value. This action clears the primary material property value. Additional options for clearing this value are described in a later section.
To change the primary material, select the row with the new material, and select the Set As Primary action. Additional options for changing this value are described in a later section.
4. Save or save and check in the changes to the BOM. The Primary Material attribute group in the BOM header updates with the new information. The selected material is now set as the primary material for the BOM and is identified as primary in the BOM editor.
* 
If the values do not appear, refresh the page after saving.
Material-Supplier Combinations
For materials selected from the material library, the following conditions apply:
The material-supplier combination is set automatically if the supplier is specified in the row that was used to set the primary material.
The material-supplier combination is not set automatically if supplier information was not specified in the row used to set the primary material.
If a supplier is not specified for the material, supplier information is not available in the line sheet.
When the primary material is updated, supplier information is also updated if it specified.
Clearing the Primary Material Attribute Value
During the product development process, you might need to clear or change primary material information within the BOM. Do one of the following to clear the primary material attribute value:
In the BOM editor, click Clear Primary Material to remove the primary material from the BOM.
Delete the BOM row that contains the primary material. If the material does not exist in any other row of the BOM, saving or checking in the BOM generates a message that the primary material no longer exists. You are asked to clear the value.
Change the library material on the BOM row to a different library material. If the original material does not exist in any other row of the BOM, saving or checking in the BOM generates a message that the primary material no longer exists. You are asked to clear the value.