This is not working for me. I have issued the SIMPLE IRA additional employer-only contribution lump sum outside of our pay checks. Regardless, I tried setting this up as detailed above, but I can't assign it to my employees since they already have a SIMPLE IRA plan attached in QBO. I get an error "We can't assign 2 employees", and I only have three including myself. 

I need to know how to enter a one-time contribution, not a recurring contribution tied to pay checks.