Digital BW, The Print

It seems you can\ufffdt load a curve in the yellow ink for a partitioned setup?
Am I missing something?

I have:
Black \ufffd not used
Cyan \ufffd Gray ink, density 100, limit 85
Magenta \ufffd copy C
Yellow \ufffd Load curve (point pairs), limit 100
Light Cyan \ufffd gray ink, density 35, limit 37
Light magenta \ufffd copy C

Create curve, and yellow is missing.

Best regards,
John Moody