If the incoming waybill number is entered incorrectly, you need to take the following measures in time:

1. Contact the supplier to confirm whether the waybill number is correct and ask the supplier to re-ship the goods.

2. If you cannot contact the supplier, you need to contact the purchasing department or warehouse manager in time to handle it.

3. If you cannot find the correct waybill number, you can try to contact the logistics company or express company to inquire about the waybill information.

4. If the problem cannot be solved, you need to report to the company's leaders in time to seek help and solutions.

When dealing with the problem of incorrect incoming waybill numbers, you need to keep communication open, be proactive, and take timely measures to avoid unnecessary losses to the company.