You can add or update a Purchase Order (PO) number in the LinkedIn Admin Center. A PO number is a unique identifier assigned to a purchase to help track it.
In LinkedIn Admin Center, you can update the PO number at the contract level. This ensures that all future invoices for that contract will reference the updated PO number.
To edit a PO number:
Sign in to the LinkedIn Admin Center.
Click Contracts & Orders on the left pane.
From the list of contracts, select the contract you want to update.
Scroll down to the Billing information section.
Click Edit next to the PO number field.
Enter the new PO number you want to add to this contract in the PO number for contract [contract number] pop-up window.
Click Save to update the PO number.
Note: If you need to update the PO number for past or open invoices or for other order types, please contact LinkedIn support by clicking Start chat at the bottom of this help center article.