From what you describe, you should have a schedule E included with your return.
A schedule E would be used to either report rental income and expenses or your interest in an S corporation or partnership. If you had either one of those in that year, you should have a schedule E.
Form 6198 reports at-risk limits in a business entity that you own. Schedule K-1 reports your share of income or loss from a partnership or S corporation. It gets reported on page two of schedule E. The fact that you have a Form 6198 would indicate that you have an ownership interest in a company and the K-1 would indicate that it was a partnership or S Corporation. The K-1 form gets reported on page 2 of schedule E, so since you have a Schedule K-1, you should have completed a Schedule E.
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