Mazak Mazatrol CAM T-2 Question - MNP Process

I have generally been parting off using a manual process so I can also chamfer the back side of the part during part off. Using a 3mm groove tool. I changed this process for a part I am now working on to put a 0.03" radius on the back side instead of a chamfer- Using G03. It gives me a "Illegal G Code Input" error. If I change the G03 to a G01 it makes a 45 degree chamfer. What am I doing wrong? (Photos Below).

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