Module "Calls", field "Call_Status" - "unsupported column" error

Module "Calls", field "Call_Status" - "unsupported column" error

Dear Zoho developers!
I've got a really strange problem. 
There are 2 Zoho CRM accounts:  my developer's account and one of my client's account.
Requesting metadata: https://www.zohoapis.com/crm/v2/settings/fields?module=Calls for the Calls module will provide the same result for the Call_Status field, with the only difference in ID value:


  2.         {
  3.             "system_mandatory": false,
  4.             "webhook": false,
  5.             "json_type": "string",
  6.             "crypt": null,
  7.             "field_label": "Call Status",
  8.             "tooltip": null,
  9.             "created_source": "default",
  10.             "field_read_only": false,
  11.             "display_label": "Call Status",
  12.             "read_only": true,
  13.             "association_details": null,
  14.             "businesscard_supported": false,
  15.             "multi_module_lookup": {},
  16.             "currency": {},
  17.             "id": "xxxx000090001",
  18.             "custom_field": false,
  19.             "lookup": {},
  20.             "visible": true,
  21.             "length": 120,
  22.             "view_type": {
  23.                 "view": false,
  24.                 "edit": false,
  25.                 "quick_create": false,
  26.                 "create": false
  27.             },
  28.             "subform": null,
  29.             "external": null,
  30.             "api_name": "Call_Status",
  31.             "unique": {},
  32.             "history_tracking": false,
  33.             "data_type": "picklist",
  34.             "formula": {},
  35.             "decimal_place": null,
  36.             "mass_update": false,
  37.             "blueprint_supported": false,
  38.             "multiselectlookup": {},
  39.             "pick_list_values": [],
  40.             "auto_number": {}
  41.         }


The following COQL query: https://www.zohoapis.com/crm/v2/coql
  1. {
      "select_query": "select Call_Status  FROM Calls WHERE Owner is null OR Owner is not null LIMIT 200 OFFSET 0"
    }
Returns:
  1. For my account:
  1. {
  2.     "data": [
  3.         {
  4.             "id": "4197230000000241660",
  5.             "Call_Status": "Overdue"
  6.         }
  7.     ],
  8.     "info": {
  9.         "count": 1,
  10.         "more_records": false
  11.     }
  12. }
  1. For client's account:
  1.  {
  2.     "code": "INVALID_QUERY",
        "details": {
            "column_name": "Call_Status"
        },
        "message": "unsupported column",
        "status": "error"
    }

So, dear developers, why? And how to fix this?