Business & farm

The EPD cover letter states: "The Partnership will report items of international tax relevance to our partners on Schedule K-3. All of our income is effectively connected with a United States trade or business. A limited number of unitholders (primarily foreign unitholders, unitholders
computing a foreign tax credit on their tax return and certain corporate and/or partnership unitholders) may need the detailed information disclosed on Schedule K-3 for their specific reporting requirements."

Unless you are likely to be affected by the above, you can uncheck the K3 box and file as normal.  When it eventually comes out, you can review and amend if needed.