> For the complete documentation index, see [llms.txt](https://local.docs.ssaudit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://local.docs.ssaudit.com/english-1/e-invoice/9.5-issues-invoice.md). # 9.5 Invoice Issuance
Some information which needs to note during input through 2 modules: Invoice date: If the company needs to back-date an invoice, you must enter the desired date manually. For Viettel providers, the company can back-date up to 25 days from the current date, provided no invoice has been issued after the chosen date (to maintain sequential numbering). For example, today is 1st July. The company can back-date to as early as 6th June. If the company chooses 15th June, it can only issue that invoice if no invoice has been issued with a date after 15th June. Invoice number: Generated automatically according to the invoice form number (mẫu số) and series symbol. ### a) Input data through Inventory Management Module
Choose inventory voucher for E-Invoice issue >> Choose Handling type: Release
Open E-invoice issue screen >> vouchers which choose will be shown on data grid
### b) Input and issues invoice through Account Receivable Module
Choose Release batches function
Choose Voucher which issue >> choose E-invoice checkbox and Click Execute *** ### Create an invoice issuance notice **When to use:** When you need to declare an **issuance notice** for each invoice form before use: serial, the range of numbers allowed for issuance, and tracking of used / deleted / lost / cancelled numbers per form. ![](https://632035940-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MS6wMckMyiqOiAIvWnY-1703796690%2Fuploads%2Fgit-blob-9ca8520cdd2f6a60135c2a5fcd5b0e20deb9afde%2Feinvoice-issue-01.png?alt=media) To create an invoice issuance notice, proceed as follows: 1. The system auto-generates the **Issue number** and pre-fills the company details (name, address, tax code, phone); enter the **Issue date**. 2. On the grid, add each invoice form: enter/select the **Form** (press **F3**), **Form name**, **Form serial**, **Serial**. 3. Enter the number range: **From no. / To no.** and the tracking numbers (used, deleted, lost, cancelled) if any. 4. Click **Save** to finish. Use **New** to create another issuance notice, **Delete** to remove an unused one. * **Operational notes:** * **Form serial** is 11–13 characters; **Serial** follows the `VN/YY[E/T/P]` format (6 or 8 characters). * Company details are taken automatically from Company information and cannot be edited here. * An issued notice cannot be edited or deleted (view only).