Product Structures and Formulas
Product structures and formulas provide some of the information used in MRP calculations, including component quantities, lead times, and effective dates. Enter and modify product structure and formula information in Product Structure Maintenance (13.5) and Formula Maintenance (15.5).
See
topic and
topic for details.
Component Quantity
To calculate component requirements for planned orders, MRP multiplies each component’s quantity per assembly value by the planned order release quantity.
Component Lead Time
MRP determines a component’s due or required date using the scheduled release date of the parent item and the component lead time offset specified in the product structure.
Example: When a component’s lead time offset is 10 days, its due date will be 10 manufacturing days after the planned release date of the assembly. When it is –5 days, the due date is 5 manufacturing days before the planned release date of the assembly.
If no lead time offset is specified for a component, the component release date will be the same as the release date for the parent item.
Component Effective Dates
MRP uses component effective dates to determine which components are required for a given order due date. Components are active beginning on the start date specified in the product structure and remain active through the stop date, the last day a component will be used.
See
Engineering Effectivity for more information on how MRP handles component effective dates.