Schedule K-1 (form 1065) & Schedule K-3

I already filed my 2022 tax, then I received a Schedule K-1 (form 1065).  Box 16 indicated that Schedule K-3 is attached if checked but I didn’t receive K-3 form.   

1/ I want to file an Amend Tax Return to include the Schedule K-1 form this week but I don’t have the K-3 form.   What should I do? Can I answer ‘No’ to ‘Is your Box 16 checked?’   If so, will it show an error in IRS when they compare the K-1 form?  Do I have to file another Amend Tax Return when I receive form K-3?  

2/ What is the deadline to amend Tax Return for 2022?   When is the deadline for business to send out form K-3?   Will Turbo Tax support Schedule K-3?

3/ Schedule K-1 form: box 13 Other Deductions, code = W, amt = $280.  When TT ask me about code W.  I don’t know which one to answer.  It’s NOT: Early Withdrawal Penalty, Taxes and State Income Tax Withheld.  Other details are: Investment Interest Expense, Misc Itemized Deductions, Nonpassive Deductions to be Reported on Sch E, Section 754 Depreciation, I have Another Description Item.  Where do I find out the information?

Thank you so much!