Illinois part year returns that generate EF Messages 0535 and 0561 must be paper filed.
The text of EF Message 0535 states that IL Schedule CR Step 5, Line 44 – 49 must be blank for EF transmission. Step 5: Part-year residents only appears in ILCR.PG3 in view. These lines are not blank when it is a PY return.
EF Message 0561 is generated because only IL Residents can electronically file the IL-CR. A part-year resident generates error 0561. A non-resident on the federal screen 1 (or on the IL CR screen) cannot generate the ILCR.
Suppressing the IL CR:
If you're in a PY return and you do not think the IL CR should be produced, just mark the Nonresident of Illinois box at the top of the IL CR screen (Credits tab).