These deductions are based on paying rent or property tax on your principal residence during the year. If you paid Indiana property tax on your home and also paid rent on your Indiana home (maybe you sold your house, got married, etc.), you can take both deductions on your Indiana income tax return. You can deduct up to $3,000 of the rent paid and/or up to $2,500 of the Indiana property tax paid.
Contact the Department of Revenue if you need further clarification.