> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://support.sonas.events/sitemap.xml
> Use this file to discover available pages before exploring further.
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# How to Add or Edit a PO number on an Invoice.

Sonas allows to you easily edit or add PO numbers to Invoices. 

> If you cannot see this section or get permission denied messages with any of the actions, please contact your Company Admin in order to get the required permissions.

## How to Add a PO number

You, as a staff user, can add a PO number a few different ways/time. 

-  When adding a payment, [Adding Payments](/en/article/how-to-add-payments-8wq745), by adding in the PO on step 2. 

![](https://storage.crisp.chat/users/helpdesk/website/-/d/5/c/e/d5ce36403ada6800/fb9b7d0f9f79ebe2e43e7c9ecd4e12_pfc9i9.png)
-  Once there is an Invoice raised, click the PO# icon and add

![](https://storage.crisp.chat/users/helpdesk/website/-/d/5/c/e/d5ce36403ada6800/abdae93470ed3dc749adf41cb1bec6_3hzdz3.png)

![](https://storage.crisp.chat/users/helpdesk/website/-/d/5/c/e/d5ce36403ada6800/0b9c1063800ff4a206a1fc9986a1c2_wbzfr9.png)

## How to Edit an PO Number

If you need to edit a PO number, click the PO# icon next to the Invoice you need to change it for and amend by deleting or correcting the existing number and clicking OK.