To follow up on the problem, this morning I spent a total of 2 hours on the phone with two separate TT support folks. Both were reasonably knowledgeable and tried very hard to help me with this problem; both escalated to their backline support. But in the end there was no solution except to ignore the errors and file on paper.
Fundamentally the problem is that no way could be found in Turbotax Business (WinBizRelease 023x000x0242) to satisfy the requirement, enforced by the Tax Payments Worksheet, to complete the California Form 593 Real Estate Withholding Statement. The same problem would occur for a Form 592 Resident and Nonresident Withholding Tax Statement -- there is no way to complete one of those either. Because of this, ticking the checkbox on Part II line 2 creates an error, both on the worksheet and on line 31 of Form 541. The amounts, however, are all calculated correctly with that change.
