This is the message I got, however I used the same account before without problem, please assist

Hi honorine-muhriwa,

Welcome to Community!  It's important that you're able to record your expenses seamlessly in QuickBooks Online.  I'd be happy to assist!

Here's how to enter a bill;

1. From the left menu, open +New and select Bill

2. Use the ▼ dropdown to choose the Supplier

3. Choose the Terms 

4. Enter the Bill date, Due date, and Bill number

5. In the Category details section, select the Expense account you use to track expenses 

6. Enter a Description

7. Add the Amount and Sales tax

8. Hit Save and close when complete

Here's a helpful guide for your reference.

If you have any other questions, feel free to reach back out.  We'd love to help!

Thank you for your reply, but that is how I do it.

for exemple when I use account # 2320 via bill it give me that message that I can not use an account payable account on the détail portion of a bill, however when I use the same account 2320 via expense it works!! 

Hi there honorine-muhriwa,

As the balance of all bills will have an effect on an Accounts payable account, Accounts payable is not an eligible account to be chosen in the line items of a bill. I can see how you'd like to be able to use this account for the purpose of entering bills. I recommend leaving feedback in the system by clicking on the Gear icon, then Feedback. The Comments made in that section are taken into consideration by our developers when designing new features for QuickBooks Online.

If you have any other questions, feel free to reach out here.