@ Strongsilence-CPA - thank you. The CTRL W worked to allow me to see the codes Karl was referring to. The code shows up on the input screen window, not the left-hand side bar, as you show above.
@ Karl - I want to apply $800 to the CA annual state tax (code 31) and $900 to the CA LLC fee (code 18), so that is what my input reflects. When I remove the $800 from code 31 screen, the diagnostic we are discussing goes away, so you are correct in your instruction, however, I want to apply the $800 and the $900, and refund the balance. This seems to be an informational diagnostic, so I think I can still file as is, but its strange to me there is a diagnostic.
Thanks for the help!