Diagnosis
When you configured your system landscape you decided to use theTransport Workflow for imports into this system. Only make manualimports in exceptional cases.

System Response
The TMS terminates the first import to make sure that you are notimporting manually by mistake.

Procedure
It is up to you to make sure that you are not importing requests thatare already in the Transport Workflow.
If you still want to import manually, proceed as follows:
Confirm the dialog box informing you that imports into this system aremade with the Transport Workflow. The import queue appears.
Choose Import request. The dialog box appears again.
Confirm the dialog box again. The dialog box Import transportrequest.
Choose the appropriate options and start the import with Continue
.