The full English name of BOM is Bill of Material, the Chinese name is "Bill of Materials", and the English abbreviation is "BOM". Everyone is used to calling the English abbreviation BOM.
BOM is a product structure data file that can be recognized by a computer, and it is also the dominant file of ERP. The BOM enables the system to identify the product structure, and is also the link to connect and communicate with the various businesses of the enterprise. The types of BOMs in the ERP system mainly include five categories: indented BOMs, aggregated BOMs, reverse-check BOMs, cost BOMs, and planned BOMs.

Using computer-aided enterprise production management, first of all, the computer must be able to read the product composition and all the materials involved. In order to facilitate computer identification, the product structure expressed by the diagram must be converted into a certain data format. The file that describes the product structure in data format is the bill of materials, or BOM. It is a technical file that defines the product structure, so it is also called a product structure table or a product structure tree. In some industries, it may be called a "recipe", "element table" or other names. In MRP II and ERP systems, the word material has a broad meaning. It is a general term for all products, semi-finished products, work-in-progress, raw materials, accessories, cooperative parts, consumables and other production-related materials. In the usual MRP II and ERP systems, BOM refers to the relationship tree composed of parent parts and child parts. The BOM can provide information in the form of a top-down decomposition or a bottom-up trace. In MRP II and ERP systems, BOM is an organizational relationship between data, and the hierarchical relationship between these data can be used as the basis for the design of many functional modules. Some forms of these data are summary reports that we are all familiar with.
What is the function of BOM?
BOM is the most important basic data in PDM/MRPⅡ/ERP information system. Its organizational format design and rationality directly affect the processing performance of the system. Therefore, according to the actual use environment, flexibly design a reasonable and effective BOM is a very important.
The BOM is not only an important input data in the MRP II system, but also an important basis for the financial department to calculate the cost and the manufacturing department to organize production. Therefore, the BOM has the greatest influence and the highest requirement for its accuracy. Correct use and maintenance of the BOM is a very important task during the operation of the management system.
In addition, BOM is also an important interface between CIMS/MIS/MRPⅡ/ERP and CAD, CAPP and other subsystems, and is the key point of system integration. Therefore, when implementing BOM management by computer, it should fully consider its information exchange with other subsystems question.
BOM information is used in MRP II/ERP system for MRP calculation, cost calculation, and inventory management. There are various forms of BOM, these forms depend on its use, the specific use of BOM is:
1. It is the basis for computer identification of materials.
2, is the basis for the preparation of the plan.
3. It is the basis for matching and picking materials.
4. Track the processing process according to it.
5. It is the basis for purchasing and outsourcing.
6. Calculate the cost according to it.
7. It can be used as a quotation for reference.
8. Carry out material traceability.
9. Make the design serialized, standardized and generalized.






