Define a field ID for a custom field
When you create a custom field, the system automatically assigns it a unique alphanumeric field ID. To make it easier for users who need to report and script on custom fields, you should establish a meaningful naming convention for your field IDs. You can change the default ID to one that complies with these conventions. The field ID can’t be changed after the field is created. You can define a field ID from a saved transaction or other supported record in view mode, or from the Customization section Fields page. For more information about the Customization section, see Get started with the Customization section.
For more information, see Create a custom field.