By providing a parts structure with the attribution of Parent Item Number, a specific bill of materials can be identified. The product structure shows the relationship between one item and another, clarifying the parent-child relationship. Parent Item Number is the item number of parent in product structure, while Child Item Number is the item of child. Expressing the bill of materials using items and the product structure, the parent item of Item a is Item X, and the child item is Item "イ" in the figure.

Related term: Item Number
Antonyms: Child Item Number