--- title: "Why are UOM and item details not filled in when I add an item to a Material Request" space: "ERPNext" url: "https://docs.frappe.io/erpnext/why-are-uom-and-item-details-not-filled-in-when-i-add-an-item-to-a-material-request" updated: "2026-10-27" --- You select an item in the **Items** table of a Material Request, but **UOM**, **Stock UOM**, **UOM Conversion Factor** and the item details stay blank. When you click **Save**, you see `Stock UOM is required in every row`. This page explains why and how to fix it. ## **What you see** After you select an item in the **Item Code** column, the row stays blank. When you click **Save**, this message shows: ``` Missing Fields ``` `Please fill the following mandatory fields before saving:` `In Items, Stock UOM is required in every row.` If you open the browser console (press **F12**, then open the **Console** tab), you can also see one of these errors for `erpnext.stock.get_item_details.get_item_details`: ``` pydantic_core._pydantic_core.ValidationError: 1 validation error for is-instance[_dict] ``` `Input should be an instance of dict [type=is_instance_of, input_value='{"item_code":"...","uom":""}', input_type=str]` ``` frappe.exceptions.FrappeTypeError: Argument 'ctx' in 'erpnext.stock.get_item_details.get_item_details' should be of type 'frappe.types.frappedict._dict' but got 'str' instead. ``` ## **What should happen** When you select an item, ERPNext gets the item details from the **Item** master and fills the row: - **Item Name** and **Description** - **UOM**: the purchase unit of measure of the item, or its default unit of measure - **Stock UOM**: the **Default Unit of Measure** of the item - **UOM Conversion Factor**: how many stock units are in one **UOM** - **Warehouse**, from **Set Warehouse** or the item defaults ![Material Request Items row with UOM filled in](/files/pasted-image-tnqjdfwu.webp) To see all the fields of a row, click the edit icon at the end of the row. ![Row detail with UOM, Stock UOM and UOM Conversion Factor](/files/pasted-image-awnif1un.webp) ## **Why this happens** ERPNext fills the row with one server call, `get_item_details`. If this call fails, nothing is filled in, and the row cannot be saved because **Stock UOM** is mandatory. The usual causes are: 1. **A bug in ERPNext v16.** From ERPNext v16.30.0, `get_item_details` failed on sites that run on Python 3.14. So the item details were not filled in on Material Request and some other forms. ERPNext **v16.32.3** fixes this ([pull request #58118](https://github.com/frappe/erpnext/pull/58118)). Most tickets about this problem came from this bug. 2. **A customization on Material Request Item.** A **Property Setter** (a saved change to a standard field) or a **Client Script** can change how the **Item Code** or **UOM** field works. For example, a changed **Fetch From** on the **UOM** field leaves **Stock UOM** blank. A changed link filter on **Item Code** makes the item list empty. 3. **A problem in the Item master.** The item has no **Default Unit of Measure**, or the item is disabled. 4. **An old copy of the page in your browser.** After an update, the browser can still use old JavaScript files. ## **How to fix it** Do these checks in order. Stop when the row fills in. ### **1. Update ERPNext** 1. Check your version. Open the **Help** menu and click **About**. If **ERPNext** shows a v16 version older than **v16.32.3**, update your site. 2. If your site is on Frappe Cloud on a shared bench, the weekly update installs the fix. You do not need to do anything. 3. If your site is on Frappe Cloud on your own bench group, deploy the latest version of the bench group. Then update your site. 4. If you host ERPNext yourself, run `bench update`, or ask your service provider to update the site. ### **2. Reload the page** 1. Open the Material Request. 2. Press **Ctrl + Shift + R** (on macOS, **Cmd + Shift + R**). The browser loads the new files. 3. Select the item again in the **Item Code** column. ### **3. Check the Item master** 1. Open the item: go to **Stock → Item** and open the item. 2. Make sure **Disabled** is not selected. 3. Make sure **Default Unit of Measure** has a value. 4. If you buy the item in a different unit, open the **UOM** tab. Add the unit and its **Conversion Factor** in the table. Set **Default Purchase Unit of Measure** in the **Purchasing** tab. 5. Click **Save**. ![Item master with Default Unit of Measure](/files/pasted-image-o7c0baf8.webp) ### **4. Check customizations** You need the **System Manager** role for these steps. 1. Go to **Property Setter** list. Filter by **DocType** = `Material Request Item`. 2. Look for changes to the fields **item\_code**, **uom**, **stock\_uom** or **conversion\_factor**. For example, `link_filters` on **item\_code** or `fetch_from` on **uom**. 3. If a change is not needed, delete it. Or go to **Customize Form**, select **Material Request Item**, and click **Actions → Reset All Customizations**. This removes every customization on that table. 4. Go to **Client Script** list. Filter by **DocType** = `Material Request`. Clear **Enabled** on each script, then test again. 5. If the row now fills in, the customization caused the problem. Correct the script or the setting, then enable it again. ## **If you need to make a Material Request now** On an affected version, there is no reliable workaround. Some customers could not save the row even after they entered the **UOM** manually. The fix is to update ERPNext. **To check:** whether you can save if you open the row with the edit icon and enter **UOM**, **Stock UOM** and **UOM Conversion Factor** manually. ## **How to prevent it** - Keep your site on the latest minor version of ERPNext v16. - If you use a private bench, test updates on a staging site before you update the production site. - Keep a list of your customizations on Material Request. After each update, test that adding an item still fills the row. ## **If this does not fix it** Raise a support ticket and attach: - Your site name and the ERPNext and Frappe versions from **About**. - The Material Request name, or the steps to make the problem happen again. - A screenshot of the blank row and the error message. - The error from the browser **Console** (press **F12**). Copy the full text of the red error for `get_item_details`. - If you use a custom app, its name, and whether the problem stops when the app is not installed on a test site. ## **Related** - [Material Request](https://docs.frappe.io/erpnext/material-request) - [Item](https://docs.frappe.io/erpnext/item) - [Unit of Measure (UOM)](https://docs.frappe.io/erpnext/uom) - [Customize Form](https://docs.frappe.io/erpnext/customize-form)