Bills of material are described link by link. A link represents the relation between a parent item and one of its components.
The update of the product structure record is done from the Item record of the parent item. It describes every link between the parent item and the component items.
The sequence number lets you sort the product structure records.
The component item must have been previously created in the Item file.
The quantity can be whole or fractional (according to the number of decimals indicated in the item record).
You can also
indicate a number of components for a given quantity of parent item. For example
a quantity of 50 (50 units of components) for a quantity of 800 (units of parent
item) corresponds to a ratio of 0.0625 unit of component by unit of parent item.
You can use this feature if the packaging material is defined in the item BOM:
for instance, if the item is packed in boxes of 12 units, you should record a
coefficient of 1 for a parent quantity of 12.
The operation
number specifies to which operation of the parent item routing the component is
used. This number is used if the manufacturing lead time is calculated from
routings and if components are linked to each operation (see Advanced
Planning Options, Planning chapter). It is also used in Finite Capacity
Scheduling if you choose Priority Rule Scheduling and you select the option
“Check component availability” (see Advanced options for priority rules
scheduling (Scheduling chapter).
Dates of validity
of the product structure records
Technical innovation of manufactured products leads to the replacement some components or the modification the composition of the product. However, it is necessary to keep the historical record of evolutions for the following reasons:
•the after sale service must supply some spare parts,
•we must keep the budget records,
•modifications must be planned for before they are put into manufacture.
For this you can specify on every product structure record a validity start date and a validity end date (by default 12/31/9999).