> ## Documentation Index
> Fetch the complete documentation index at: https://foliant-help.iforiti.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 发票与编号

> 为发票、贷项通知单和报价单编号，锁定已开具的发票，并保存和验证原始文件。

为您的发票、贷项通知单和报价单设置连续编号，并将每张已开具的发票按发送时的原样保存，这是许多国家/地区税务规定的要求。

## 编号

1. [设置单据编号](https://foliant-help.iforiti.com/cn/invoices-and-numbering/document-numbering.md)
2. [单据何时获得编号](https://foliant-help.iforiti.com/cn/invoices-and-numbering/when-documents-get-numbers.md)
3. [在订单上查看单据编号](https://foliant-help.iforiti.com/cn/invoices-and-numbering/document-numbers-on-orders.md)

## 锁定的发票

4. [锁定已开具的发票](https://foliant-help.iforiti.com/cn/invoices-and-numbering/locked-invoices.md)
5. [使用贷项通知单更正发票](https://foliant-help.iforiti.com/cn/invoices-and-numbering/credit-notes-for-refunds.md)
6. [“已开具的发票”页面](https://foliant-help.iforiti.com/cn/invoices-and-numbering/issued-invoices-page.md)
7. [验证 PDF 和哈希链](https://foliant-help.iforiti.com/cn/invoices-and-numbering/verify-a-pdf.md)
8. [下载存档以及单据的保存期限](https://foliant-help.iforiti.com/cn/invoices-and-numbering/archive-and-retention.md)
9. [将已开具的发票保存到 Google Drive 或 Dropbox](https://foliant-help.iforiti.com/cn/invoices-and-numbering/cloud-archive.md)
10. [为已开具的发票添加电子发票数据（ZUGFeRD / Factur-X）](https://foliant-help.iforiti.com/cn/invoices-and-numbering/e-invoices.md)


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