Creating a Custom Entity Field Without Prefix in "custentity"

I am currently facing an issue while trying to create a custom entity field without the "custentity" prefix in my NetSuite account. I have followed the standard procedure for creating a custom entity field, but it appears to automatically add the "custentity" prefix to the field ID.

My specific requirement is to have a custom entity field with the ID "customform" for our entity records. This field will serve a unique purpose within our organization.

Despite multiple attempts to create the field without the prefix, I have not been successful. I have also explored the option of creating a custom record, but I still encounter the same issue.