Reference lines won't show up on chart

[#1]

Hi everyone,

I'm currently writing a script that, eventually, generates charts.  On these charts, I add 6 reference lines.  2 of them just won't show:

vlbCharts << Append(
		
		Control Chart Builder(
			Size(800, 500), // Chart size
			Show Two Shewhart Charts(0),
			Show Control Panel(0),
			Show Excluded Region(0),
			Show Limit Summaries(0),
			Show Capability(0),
			Variables(Subgroup(:BatchPrefix), Y(:Value)),
			Chart(
				Points(Statistic("Individual")),
				Limits(Sigma("Moving Range" ), Show Limits(0))
			),
			SendToReport(
				Dispatch(
					{},
					"Control Chart Builder",
					OutlineBox,
					{Set Title(sProduct ||  ": " || sComponent)}
				), // Chart title
				Dispatch(
					{},
					"Value",
					ScaleBox,
					{Min(nMinValue), Max(nMaxValue), Inc(nTicks), Minor Ticks(0),
					Add Ref Line(nLSL, "Solid", "Medium Light Orange", "LSL", 1), // Not shown
					Add Ref Line(nUSL, "Solid", "Medium Light Orange", "USL", 1), // Not shown
					Add Ref Line(nLCL, "Solid", "Medium Dark Red", "LCL", 1),
					Add Ref Line(nUCL, "Solid", "Medium Dark Red", "UCL", 1),
					Add Ref Line(nLCL_Calc, "Solid", "Dark Blue", "LCL_Calc", 1),
					Add Ref Line(nUCL_Calc, "Solid", "Dark Blue", "UCL_Calc", 1)}
				),
				Dispatch(
					{},
					"graph display 1 title",
					TextEditBox,
					{Set Text("")}),
				Dispatch(
					{},
					"Control Chart Builder",
					FrameBox,
					{DispatchSeg(Line Seg(1), {Line Color("Black")} )}
				)
			)
		);
	);

The problem is the label "LSL"  and "USL".  When I change these to something else (eg "US" and "LS"), the lines will be displayed:

Add Ref Line(nLSL, "Solid", "Medium Light Orange", "LS", 1), // shows on chart

Add Ref Line(nUSL, "Solid", "Medium Light Orange", "US", 1), // shows on chart

Is there any way I can actually use LSL and USL as labels?

Thanks,

Jan

[#2]

This seems to be a bug in the control chart builder platform as it works manually but not in code. I can reproduce the issue on JMP 16 EA8 and have submitted a bug report.

[#3]

@jan_solo 

This is just a wild guess knowing how JMP labels reference lines. Specify your reference lines with names USL and LSL and add the message to your control chart object.

cc_obj << Show Spec Limits(1); 

If that doesn't work, an alternative is shown in the JMP > Help > Scripting Index 

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Reliability/GaAs Laser.jmp" );
obj = dt << Degradation(
	Y( :Current ),
	Time( :Hours ),
	Label( :Unit ),
	Set Upper Spec Limit( 7.5 )  //set the spec limits
);
obj << Show Spec Limits( 1 );

My fingers are crossed.

[#4]

@gzmorgan0 is correct.  You need to add the following command to your CCB code.

Show Spec Limits( 1 );

USL and LSL are the names JMP uses when you have a spec limit column property.  Some users have requested that spec limit column properties not show by default in control charts.  This is how the platform turns those off and on.  You are using the same names JMP uses so,  you will therefore need to use the above command to see them.