The transaction number of Sichuan E social security welfare certificate cannot be empty.

The solution to this situation is as follows:

1. Confirm whether the transaction number has been entered. You may be asked to enter the transaction number when filling in the relevant forms. If you forget or are not sure, you can contact relevant customer service or technical support for help.

2. Check whether the transaction number filled in is correct. The transaction number is usually a combination of numbers or letters, which may have certain rules or restrictions. Ensure that the entered transaction number meets the system requirements.

3. Confirm whether all the above steps have been completed. Some systems may need to complete some pre-steps before dealing with treatment certification, such as filling in personal information and uploading certificates. Ensure that all preparatory steps are completed according to the system requirements.

4. Please try the operation again. Sometimes, there may be temporary problems or errors in the system, resulting in the failure of normal operation. You can try this operation again to see if it can solve the problem.