Returns 204 if the account can add another custom-field definition, and 400
if it is at its limit. Despite the /validate path, the call checks only the
definition count: it takes no body and does not validate a proposed field. A
204 does not reserve capacity, so a later create can still fail. Limits vary
by account. Requires the CustomField:Read permission.
| Time | Status | User Agent | |
|---|---|---|---|
Retrieving recent requests… | |||
Capacity check passed; no body.
Invalid payload, context, or ID; an ownership or lifecycle restriction; a capacity limit; or a TrueTest failure. The error body format varies.
Authentication or the required user context is missing or invalid. The error body format varies.
The caller lacks the operation permission or access to the resource. Headers do not grant access. The error body format varies.
Any other error. The error body format varies.