How to set control limit based on datatable limit

[#1]

Greetings, 
I'm using JMP 17, I tried to set control limit based on the datattable. 
when I run the script, it prompts me to set the control limit manually although i have assign the control limit value in script.
Is it able to set the control limit without manual key in (without prompt the windows)?



below is the script that will prompt the set control limit window:

Names Default To Here( 1 );
dt2 = Open( "$SAMPLE_DATA/Little.jmp",invisible );
//[Get Limit]
Limit = New Table("C1",
    New Column("lcl", Character,"Nominal",Set Values({"4"}),
    ),
    New Column("ucl", Character,"Nominal",Set Values({"17"}),
    ),
    New Column("avg", Character,"Nominal",Set Values({"10.7"}),
    ),
    New Column("lcl2", Character,"Nominal",Set Values({"0"}),
    ),
    New Column("ucl2", Character,"Nominal",Set Values({"8"}),
    ),
    New Column("avg2",Character, "Nominal",Set Values({"3"})
    )
);

lcl = Char(Limit:lcl[1]);
ucl = Char(Limit:ucl[1]);
avg = Char(Limit:avg[1]);
lcl2 = Char(Limit:lcl2[1]);
ucl2 = Char(Limit:ucl2[1]);
avg2 = Char(Limit:avg2[1]);


g = dt2 << Control Chart Builder( 
	Variables( Y( :yield ) ), 
	Chart(
		Position( 1 ),
		Limits,
		Warnings( Test 1( 1 ), Test 3( 1 ) ),
		Set Control Limits( {LCL( lcl ), UCL( ucl ), Avg( avg )}) 	
		),
	Chart(
		Position( 2 ),
		Limits,
		Warnings( Test Beyond Limits( 1 ) ),
		Set Control Limits( {LCL( lcl2 ), UCL( ucl2 ), Avg( avg2 )}) 	
	)	
);

[#2 · Accepted solution]

Store the values which are numeric as numeric values and it might work. And if that isn't enough you might have to evaluate them to Control Chart Builder Insert one expression into another using Eval Insert, Eval Expr, Parse, and Substitute 

[#3 · Accepted solution]

To add to @jthi's response, I would also avoid giving a variable the same name as a data table column to avoid conflicts.