How to Add a Measurement Unit to Products or Services – Fixing the ‘Measurement Unit Required’ Invoice Error

Units of measurement are used to determine how products are displayed and sold within the system.
Selecting a unit of measurement is mandatory when creating a product; a product cannot be saved without specifying a unit of measurement.

When creating an invoice and adding a product to the line items, a quantity field appears to specify (quantity, unit of measurement). If a unit of measurement is not selected, an error message will appear: “Unit of measurement must be selected” and the invoice cannot be saved.

You can add new units of measurement in two ways, and all added units are available for all products in the system.

First: Available Types of Units of Measurement

When adding a unit of measurement, you must select the unit type (optional? No, mandatory).

The available types are:

• Unit of measurement

• Weight

• Working hours

• Length / Distance

• Area

• Volume

Selecting a unit type is mandatory, and the unit cannot be saved without it.

Second: Method One, Adding a Unit of Measurement from the Units of Measurement Page

Path

Dropdown Menu → Products and Costs → Products and Costs → Units of Measurement

Steps

1. Click Create Unit of Measurement at the top left of the page.

2. Enter the following information:

   • Unit Name: For example (centimeter)

   • Display Method: For example (cm)

   • Unit Type: Select the appropriate type (mandatory)

3. Click Save.

Third: Method Two, Adding a Unit of Measurement While Creating a Product

Steps

1. While adding a new product, navigate to the Unit of Measurement field.

2. Click on the ( + ) icon next to the field.

3. Enter the unit of measurement information:

   • Name

   • Display Method

   • Unit Type

4. Click Save.

Note:
There is no difference between the two methods, and the unit you add will be available for all products in the system.

Fourth: Important Notes Before Use

• Unit of measurement does not affect inventory quantity or balance.

• The same unit of measurement can be used for multiple products.

• Unit of measurement appears in:

  • Product screen

  • Invoices

  • Reports

Fifth: Editing and Deletion

Edit a Unit of Measurement

• You can edit:

  • Unit name

  • Display method

  • Unit type

• This is done through the Edit option next to the unit of measurement.

Delete a Unit of Measurement

• A unit of measurement cannot be deleted from the system.

• It can only be edited.

Sixth: Changing the Unit of Measurement for Products

First: Does the Product Have Movements or Invoices?

Case 1: No Movements or Invoices

You can easily edit the unit of measurement:

• Go to: Products and Costs Menu

• Click Edit next to the product

• Change the Primary Unit of Measurement

• Click Save

Case 2: Has Movements or Invoices (Sales or Purchases)

The primary unit of measurement cannot be edited in this case.

However, you have two options:

Option 1 (Recommended if you want a radical correction):

• Archive the current product

• Create a new product with the correct unit of measurement

Note: Transactions can be deleted only if possible, but it is generally not recommended because it affects financial data.

Option 2 (Without Affecting Current Data):

You can add an additional unit of measurement using Unit Conversion:

• Go to: Products and Costs Menu

• Click Edit next to the product

• Go to the Unit Conversion section

• Add the new unit of measurement

• Click Save