Настройка дней недели

Выходные дни задаются в поле attributesCustomText:

 1 attributesCustomText": [
 2       {
 3         "attributeId": 23,
 4         "levelFormats": [
 5           {
 6             "calendarLevel": "Day",
 7             "format": "{DDDD}"
 8           }
 9         ]
10       }
11     ],

Добавить новый атрибут

 1 {
 2         "id": 23,
 3         "name": "Дни недели",
 4         "code": "week_day",
 5         "description": "",
 6         "dataType": "String",
 7         "type": "Custom",
 8         "isNullable": true,
 9         "hasMultipleValues": false,
10         "isVisible": true,
11         "isReadOnly": false,
12         "tableName": "",
13         "identIndex": {
14           "code": null,
15           "isUnique": false,
16           "dbIndexName": null,
17           "fields": [],
18           "isNew": true
19         },
20         "referenceIndex": {
21           "code": null,
22           "isUnique": false,
23           "dbIndexName": null,
24           "fields": [],
25           "isNew": true
26         },
27         "defaultValue": null,
28         "defaultValueExpression": null,
29         "component": null,
30         "parentAttributeId": null,
31         "locale": null
32       }

Пример: