Permission & Access Issues

How to Fix Microsoft Lists Instance Is Read-Only Error in Grid View

Tauseeq Magsi Oct 14, 2026 870 views

Question details

The user is unable to save data in Microsoft Lists while using grid view due to an "Instance is read-only" error, despite being able to edit items individually.

How to Fix Microsoft Lists Instance Is Read-Only Error in Grid View

Product: Microsoft Lists
Device & OS: not provided
Scenario: Editing multiple rows simultaneously or pasting data from Excel into the Microsoft Lists grid view.
Observed behavior: Individual list items can be edited normally, but attempting to save edits or paste new rows in grid view triggers an "Instance is read-only" error and blocks saving.

Before you start

Verify that you have the appropriate edit permissions for the Microsoft List and ensure that the list is not checked out by another user or locked by a required workflow.

Solution 1Recommended

Correct Invalid Data in the Percentage Column

Use this solution if your Microsoft List contains a percentage column, as values outside the accepted range can trigger the read-only error in grid view.

Grid view validates data strictly. If a percentage column receives a value outside the standard 0 to 100 range, Microsoft Lists may interpret the entire grid instance as invalid, locking it into a read-only state.

Exit Grid View

Click 'Exit grid view' at the top of the Microsoft List to return to the standard list layout.

Locate the Percentage Column

Scroll horizontally to find the specific column formatted for percentages.

Correct the Values

Click on the individual items that contain erroneous data and manually enter a valid number between 0 and 100.

Return to Grid View

Click 'Edit in grid view' again and attempt to save your changes to see if the error is resolved.

Correct Invalid Data in the Percentage Column

Data Validation Complete: Entering strict numeric values (0-100) ensures compatibility with Microsoft Lists' grid view data validation rules.

Solution 2

Avoid Editing the Attachments Column in Grid View

Grid view does not support the addition or modification of attachments, which can cause the grid to lock as read-only.

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Frequently Asked Questions

Why does Microsoft Lists say read-only only in grid view?

Grid view is designed for rapid inline editing but does not support complex data types like attachments or certain customized required fields. Attempting to interact with these unsupported elements triggers the read-only error.

Can I paste data directly from Excel into Microsoft Lists grid view?

Yes, but the columns in your Excel spreadsheet must exactly match the columns in your Microsoft List. Additionally, you cannot paste data into read-only fields or unsupported columns like Attachments.

How do I fix a required information cell that does not update in list or grid view?

If a required cell is failing to update, exit grid view and open the item in the individual edit form. Sometimes, background column formatting or validation rules prevent rapid grid-view updates.

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