If you are trying to do invoice without GR/SES, then create a PO, then remove the GR-Bsd IV and S.-Based IV, then try MIRO...
The details will be copied into MIRO screen...
As per your question, It is quite not possible...
If you tick the GR-Bsd IV and S.-Based IV, then system will fetch the details only when GR/SES is done... Otherwise you will face the message "No (suitable) item found for purchase order xxxxxxxxxx"
I suggest please try with new PO, then check and revert back...