Creating a Bill of Materials (BOM)
This document explains the procedure for creating a Bill of Materials (BOM) and defining the product configuration using ERPNext.
What is a BOM (Bill of Materials)?
A Bill of Materials (BOM) is a "recipe" that lists the raw materials, parts, and processes necessary to manufacture a single product. ERPNext creates a Work Order based on the BOM and automatically calculates the required amount of raw materials.
Create a BOM
Step 1: Open the BOM list
Click on "BOM" from the "Manufacturing" workspace in the sidebar, or enter in the search barBOM Enter the following:
Step 2: Create New
Click the "+ Add" button in the upper right corner.
Step 3: Enter header information
| Item Name | Description | Required |
|---|---|---|
| Item | Item code of the finished product to be manufactured | ✅ |
| Quantity | Manufacturing quantity for one BOM (default: 1) | ✅ |
| Units | Manufacturing unit (pieces, kg, etc.) | ✅ |
| Enabled | Whether to enable BOM | ✅ |
| Default BOM | Set as the standard BOM for this item | — |
Step 4: Add ingredients
Enter the raw materials in the "Item" table.
| Item Name | Description |
|---|---|
| Item Code | Raw Material Item Code |
| Quantity | Required amount per unit of finished product |
| Units | Units of raw materials |
| Warehouse | Warehouse for distributing raw materials |
Step 5: Set up the process (operation)
When managing a manufacturing process, add the process to the "Process" section.
| Item Name | Description |
|---|---|
| Process | Process name (e.g., steaming, fermentation, packaging) |
| Workstation | Equipment and lines used |
| Time (minutes) | Standard working time |
Step 6: Save and Submit
- Save as a draft using "Save".
- Review the contents and confirm the BOM by clicking "Submit".
Hierarchical structure of BOM
Depending on the product, you can also set up a BOM for intermediate (semi-finished) products.
完成品（たれ漬け納豆パック）
├── 中間品A（たれ） ← 別のBOMを持つ
│ ├── 醤油
│ └── だし
├── 中間品B（納豆） ← 別のBOMを持つ
│ ├── 大豆
│ └── 納豆菌
└── 包装資材
By setting the Bill of Materials (BOM) for intermediate products as a "sub-BOM," you can unpack the raw materials in a single production order.
FAQ
Q: How do I modify the BOM?
Submitted BOMs cannot be directly modified. Please create a new version using the "Modify" button. The old version will remain as a history.
Q: Can a single item have multiple Bills of Materials (BOMs)?
Yes. You can register multiple BOMs as alternative recipes and specify the main BOM in "Default BOM".
Next Steps
Once the BOM creation is complete, Creation and management of manufacturing orders Let's move on.