Hi Krista Nenn ,

Great question — this is a common scenario when projects are set up after transactions are already entered.

In Sage Accounting, once a vendor bill has been paid, you can’t directly edit the original bill to add a Project the same way you could in Sage 50. However, you do have options to correct this and still get your project reporting accurate.

What you can (and can’t) do with paid vendor bills

• Paid vendor bills can’t be edited directly to add or change Projects, Departments, or Cost Centres.
• This is by design, to preserve the audit trail once payments are applied.

Instead, Sage Accounting provides a correction method that keeps your books accurate while allowing you to assign the transaction to the correct Project.

Recommended approach: Use “Correct Transactions”

To assign a paid vendor bill to a Project, you’ll want to use the Correct Transactions feature:

1. Go to Accounting > Transactions.
2. Locate the vendor bill transaction.
3. Select Correct transaction.
4. Re-enter the transaction details, this time assigning the correct Project (Analysis Type) to the expense lines.
5. Save the correction.

This creates a reversing entry and a corrected entry, preserving the audit trail while updating the Project assignment.
  Steps are outlined here:  Using Correct Transactions

Make sure Projects are enabled on transactions (going forward)

Since you mentioned you’ve already set up Projects, it’s also worth double-checking that they’re applied correctly at the transaction level going forward. This article walks through how Projects (along with Departments and Cost Centres) are assigned on transactions: How to assign Departments, Cost Centres and Projects to transactions

Going forward (best practice)

• Set Projects on vendor bills before posting or paying whenever possible.
• If bills must be corrected later, use Correct Transactions rather than editing historical entries.

If you’d like, feel free to share whether these were posted to a single expense account or multiple ones — that can affect the easiest correction path, and other community members may also benefit from the discussion.

If this helps, please mark it as verified  

Thank you, that's exactly what I was looking for.