I'm not sure about the practice in Chicago or what the trustees there expect to see. In Detroit, we generally do not include 401(k) loans as debt in schedules D, E, or F. The "creditor" after all, is you.
I personally include the 401(k) loan repayment as a deduction from income in Schedule "I" whether I am doing a Chapter 7 or a Chapter 13. I am not certain this is strictly permissible, but I have not yet drawn an objection in five years of practice (I'm knocking on wood right now).
The 401k loan should not be listed on Schedule D. As the prior answer indicated, you are the creditor since you are paying yourself back.
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That is a great question. Our office has never put the 401(k) loans or any pension loans on the Schedule D. However, we often are required to turn over the loan documentation to the trustee. This serves 2 purposes, first to verify the loan and second to verify how long it will take to pay off the loan. If the loan is paid in full at some point during the plan, the trustee may require that the plan payments increase because that loan satisfaction will mean there is more disposable income to pay towards your creditors.