Is there anywhere in the IRS tax code that states that K1 information is preferred over 1099B for sales of publicly traded partnership interests? In my case, I received both K1 and 1099B for my 2018 sale of partnership units. The 1099B doesn't list any cost basis information, so the K1 is the only record I have that includes those details. It would be nice if there was published IRS guidance that confirms that.
