If you efiled both the fed & state return then the account is LOCKED until the feds have either accepted the return or rejected it. If the feds rejects then the state rejects as well so you can make the corrections needed and re-efile it.
If the fed is accepted and the state is rejected you can also make the state corrections and re-efile it.
However if both the fed & state returns are accepted for processing you must WAIT for the original state return to be processed before trying to amend the state.