I think I may have an idea of the reason behind the X0000-005 rejection code - a QBI deduction worksheet is being generated when a taxpayer has Section 199A dividends in the 1099-DIV section. The QBI deduction worksheet has a section for the "Business Name" and since this "business income" is coming from Section 199A dividends, TurboTax is using "N/A" as the business name. Slashes such as that in "N/A" is illegal in XML formatting and that may be causing the schema validation failure with the IRS server. Not 100% positive of this but it may be worth looking into changing how TurboTax goes about naming the "business" from Section 199A dividend deduction on the QBI deduction worksheet
