sorry, i can’t really find solution can you help me?

Is your account set to either “creator” or “owner”?

If so, and you still can’t edit that field, I would reach out to support@airtable.com to ask them about this. Be sure to post back here with what they say!

i’m a owner…I can’t understand why in some cases I can create it. I don’t think there is a limit to the formulas in the free plan

Probably some bug. Let us know what they say!

He answered me this:

Hi Francesco,

Alex from Airtable Support here ?? Happy to help!

It seems you are aiming to use a formula field as the primary field. The primary field (the first column in any table) can be configured as a formula, which takes data from other fields in the table to compose a unique name for each record. This can be useful if your table does not lend itself particularly well to a single unique primary field.

For more details, please feel free to check this article.

It’s certainly not a solution…I just can’t write inside the formula field…