I'm unable to create custom fields for shipment orders, even though the custom fields are set up correctly. A request to the following endpoint:

https://www.zohoapis.com/inventory/v1/settings/preferences/customfields?organization_id=${ZOHO_ORGANIZATION_ID}&entity=shipment_order

returns the custom field successfully:

1. {
2.   code: 0,
3.   message: "success",
4.   customfields: [
5.     {
6.       customfield_id: "5416691000000146937",
7.       customfield_sequence: 1,
8.       label: "Ship method",
9.       display_param: "",
10.       related_entity_formatted: "",
11.       data_type: "string",
12.       entity: "shipment_order",
13.       is_mandatory: false,
14.       related_entity: "",
15.       values: "",
16.       is_active: true,
17.       index: 1,
18.       autocomplete_url: "",
19.       placeholder: "cf_ship_method",
20.       has_more_page: false,
21.       is_dependent_field: false,
22.       search_entity: "shipment_order",
23.       dependent_fields: ""
24.     }
25.   ]
26. }

I've tried using customfield_id, label, index, and API name, but none of these worked. After making a request to create a shipment order, I receive a response indicating that the shipment order was successfully created, but the custom_fields array is empty.

Here’s the response:

1. {
2.   data: {
3.     code: 0,
4.     message: "Shipment Order Created Successfully.",
5.     shipmentorder: {
6.       carrier: "manual",
7.       custom_fields: [],
8.       custom_field_hash: {},
9.       template_id: "5416691000000088221",
10.       template_name: "Standard Template",
11.       template_type: "standard",
12.       created_time: "2024-10-25T02:30:20+0530",
13.       last_modified_time: "2024-10-25T02:30:20+0530",
14.       packages: [...],
15.       documents: [],
16.       associated_packages_count: 1,
17.       created_by_id: "5416691000000088297",
18.       last_modified_by_id: "5416691000000088297"
19.     }
20.   }
21. }