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I ended up contacting TT support and determined that, as I suspected, the issue is simply the software not supporting this sort of situation. So, for anyone who happens to need an answer to this as well, here it is:
First of all, for anyone not familiar with the tax rules regarding partnerships and allowable 401k contributions, here it is: https://www.irs.gov/retirement-plans/one-participant-401k-plans
1. Business Info > Partner/Member Information > Member Capital > Cash Distributions Member Received from LLC: This should include the sum of the cash distributions AND the elective deferrals to retirement ("employEE" contributions).
2. Federal Taxes > Deductions > Compensation and Benefits > Employee compensation and benefits > Retirement: This is only for "common law employees" and does not apply to a sole-proprietorship or partnership. (This is what shows up on Line 18 of the 1065.)
3. Federal Taxes > Deductions > Compensation and Benefits > Member retirement contributions: This is where you will enter the employer non-elective deferrals ("employER" contributions). (This will show up on the K-1 on Line 13, Code R.)
4. For the elective deferrals ("employEE" contributions), you will then have to go to the "Forms" button in the upper right hand corner, find the K-1 form(s), and manually override Line 13. If you included "employER" contributions, Code R will already be present with the amount contributed from the company. If you are only including "employEE" contributions, there will be no code. Right click to manually override and ensure that the sum includes "employEE" and "employER" contributions. Then, include "STMT" on the line next to it, and write a note indicating how much was contributed by each.
On the individual's taxes, they will only be deducting the "employEE" portion, since the "employER" portion has already been accounted for.
Ex: Partner A makes $10,000, contributes $5,000 of that amount to retirement, and the company contributes an additional $2,000 to retirement as part of its profit-sharing plan. $10,000 is the amount that will be considered "cash distributions to member received" (see #1 above). $2,000 will be considered "member retirement contributions" (see #3 above). $7,000 will go on Line 13, Code R of the K-1 ($5,000 employEE + $2,000 employER).
A couple screen shots to help:
Note:
