List screens utilize SAPMSSY0/0120. Please check within your ABAP coding if you have any customer exit that tries to issue WRITE statements. If so, either remove them or add logic to not issue them in background (e.g. SY-BATCH = 'X'). Another culprit might be a SUBMIT statement in a user exit, which triggers a report with list output. I'm not completely sure, but I think the screen is also used for some value helps (do you have any coding forcing a value help popup?).