在sapui5中对oData调用进行第二次扩展的语法是什么？

我现在有如下检索的tableitems：

<Table
    id="table"
    width="auto"
    class="sapUiResponsiveMargin"
    items="{
        path: '/InvoiceSet',
        sorter: {
            path: 'InvNr',
            descending: false
        },
        parameters: {
            expand: 'NavInvoiceItem'
        }
    }"

expand: 'NavInvoiceItem,NavInvoiceAttachments'

还有这个

expand: ['NavInvoiceItem',
         'NavInvoiceAttachments']

expand: {'NavInvoiceItem',
         'NavInvoiceAttachments'}

还有这个

expand: ['NavInvoiceItem',
         'NavInvoiceAttachments']

expand: {'NavInvoiceItem',
         'NavInvoiceAttachments'}

---

但似乎什么都不起作用。

正如马文·斯密特（Marvin Smit）所评论的，解决方案是用逗号分隔的单个字符串，如下所示：

<Table
    id="table"
    width="auto"
    class="sapUiResponsiveMargin"
    items="{
        path: '/InvoiceSet',
        sorter: {
            path: 'InvNr',
            descending: false
        },
        parameters: {
            expand: 'NavInvoiceItem'
        }
    }"

expand: 'NavInvoiceItem,NavInvoiceAttachments'

尝试了“在单个字符串中，用逗号分隔”？