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Fix Project Online Custom Fields Missing from Formula Field Picker

Maira MehtabMaira Mehtab Sep 25, 2026 869 views

Question details

Users are unable to locate enterprise custom fields in the Insert Field list when trying to create a formula field in Project Online.

How to Fix Project Online Custom Fields Missing from the Formula Field Picker
Product
Project Online
Device & OS
not provided
Scenario
Creating a new formula field and attempting to select an existing enterprise custom field from the Insert Field dropdown menu.
Observed behavior
The custom fields do not appear in the Insert Field list in the formula editor, even though they are successfully created and visible in the enterprise custom fields configuration.
Before you start

Ensure that the enterprise custom fields have been completely saved, published, and applied to your Project Online configuration before attempting to use them in formulas.

Solution 1Recommended

Manually Enter Custom Field Names in the Formula Editor

Bypass the missing Insert Field list by typing the custom field names directly into your formula using square brackets.

Even when custom fields fail to display in the graphical interface of the field picker, the backend system still recognizes them. You can force the system to calculate the formula by manually writing the exact field name.

1
Open Formula Editor

Navigate to your Project Online enterprise custom fields configuration and open the formula editor for the specific field you are trying to calculate.

2
Type Field with Brackets

Instead of using the 'Insert Field' dropdown, type the exact name of your custom field enclosed in square brackets. For example, type `[Urgency (1-10)]` directly into the text box.

3
Complete and Save

Finish writing the rest of your mathematical or logical formula and click save. The system will validate and recognize the manually entered field.

Manually Enter Custom Field Names in the Formula Editor
Exact Matching Required: The text inside the square brackets must be an exact, case-sensitive match of the enterprise custom field name, including any spaces and special characters.
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Frequently Asked Questions

Why are my enterprise custom fields not showing in the Insert Field list?

This is a known synchronization or display glitch in Project Online where newly created or updated enterprise fields sometimes fail to populate in the formula editor's dropdown menu.

Can I still use a custom field in a formula if it doesn't appear in the picker?

Yes, you can bypass the picker entirely by manually typing the exact name of the custom field enclosed in square brackets, such as [Field Name], directly into the formula box.

How can I tell if this is a system-wide bug?

If you verify that the issue persists across multiple different projects and other colleagues are also unable to see the fields in their Insert Field list, it indicates a tenant-wide backend issue rather than a simple user error.