Overview
The Secondary Unit feature allows you to maintain an item in two different units of measurement with a predefined conversion ratio. It is useful when you purchase, stock, or sell the same item in different units, such as Box & PCS, Kg & Gram, or Dozen & Piece.
Benefits
- Maintain inventory in multiple units.
- Automatically convert quantities using a defined conversion ratio.
- Simplify purchasing and sales in different units.
- Reduce manual quantity calculations and entry errors.
Enable Secondary Unit
- Go to Settings → General Settings → Inventory tab.
- Enable Set Secondary Unit for Item, then select/add:
- Default Unit
- Secondary Unit
- Conversion Ratio
- Click Save.

Create an Item with Secondary Unit
While creating or editing an item:
- Select the Main Unit.
- Select the Secondary Unit.
- Save the item.

Use Secondary Unit in Transactions
When creating a Sales Invoice, Purchase Bill, or other inventory transaction:
- Select the item.
- Choose either the Main Unit or Secondary Unit from the Unit dropdown.
- Munim automatically converts the quantity based on the configured conversion ratio.

Example
If you configure:
- Main Unit: Box
- Secondary Unit: PCS
- Conversion Ratio: 1 Box = 10 PCS
Then:
- Purchasing 5 Boxes adds 50 PCS to stock.
- Selling 20 PCS automatically reduces stock by 2 Boxes (or the equivalent quantity).
Important Notes
- Configure the conversion ratio correctly before using the item in transactions.
- The conversion is applied automatically in inventory calculations.
- The same configuration is available across inventory-related modules, including Purchase and Sales.
- Changing the conversion ratio after transactions have been recorded may affect future stock calculations.
Need Assistance?
If the secondary unit is not available while creating an item or transaction, verify that Set Secondary Unit for Item is enabled in General Settings and that both units with a valid conversion ratio have been configured.