Hi, I'm trying to put check boxes with validations ,for that user

the question is not that clear to me.. but what i understood is: You need the validation(*) for all items instead for 2nd checkbox. infact that is the default behaviour of SAIL.

=load(
local!userAgreed,
a!formLayout(
firstColumnContents: {
a!checkboxField(
label: "select all that apply",
choiceLabels: {"c1","c2"},
choiceValues: {1,2},
value: local!userAgreed,
saveInto: local!userAgreed,
required: true,
requiredMessage: "You must check atleast one!"
)
},
buttons: a!buttonLayout(
primaryButtons: a!buttonWidgetSubmit(
label:"Submit"
)
)
)
)

Thanks Rajivfor response , let me explain bit clear. I'm using below code for selecting at least 1 checkbox else throw an validation error.

                                        Select all that apply,
a!checkboxField(
label: "",
labelPosition: "ADJACENT",
choiceLabels: {option A},
choiceValues: {"Y"},
value: something,
saveInto: something
),
a!checkboxField(
label: "",
labelPosition: "ADJACENT",
choiceLabels: {Option B},
choiceValues: {"Y"},
value: something,
saveInto: somehting,
                                         required: and(                                        
rule!APN_isBlank(ri!coreMeasure.NotCollectedByProvider),
rule!APN_isBlank(ri!coreMeasure.NotCollectedOther)
)
)
                                        
                                        For the above code , i'm getting * symbol on other but how can i get that near select all that apply so that user can able to understand that any 1 need to be selected not just other. Hope you understand now.

I would put a textField above with blank value, read only, that is only required if none of the checkbox items are selected:

=load(
local!checkValA: null,
local!checkValB: null,
a!formLayout(
firstColumnContents: {
a!textField(
label: "Select All That Apply",
value: "",
readOnly: true,
required: and(rule!APN_isBlank(local!checkValA),rule!APN_isBlank(local!checkValB))
),
a!checkboxField(
label: "",
labelPosition: "ADJACENT",
choiceLabels: {"OptionA"},
choiceValues: {"Y"},
value: local!checkValA,
saveInto: local!checkValA
),
a!checkboxField(
label: "",
labelPosition: "ADJACENT",
choiceLabels: {"OptionB"},
choiceValues: {"Y"},
value: local!checkValB,
saveInto: local!checkValB/
)
},
secondColumnContents: {},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidgetSubmit(
label: "Submit"
)
},
secondaryButtons: {
a!buttonWidgetSubmit(
label: "Cancel",
skipValidation: true
)
}
)
)
)

=load(
local!x,local!y,
a!formLayout(
firstColumnContents: {
a!textField(
label: "Select all that apply",
labelPosition: "ABOVE",
saveInto: {},
required:true(),
readOnly:true(),
value:if(and(isnull(local!x),isnull(local!y)),""," "),
refreshAfter: "UNFOCUS",
validations: {}
),
a!checkboxField(
labelPosition: "ADJACENT",
choiceLabels: {"option A"},
choiceValues: {"X"},
value:local!x,
saveInto: local!x
),
a!checkboxField(
labelPosition: "ADJACENT",
choiceLabels: {"option B"},
choiceValues: {"Y"},
value: local!y,
saveInto: local!y
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidgetSubmit(
label: "Submit"
)
}
),
validations: {}
)
)

Thanks much Steward and Rajiv , i'll work on your suggestions. I appreciate!

No problem. Note my typo on line 26, remove the "/" at the end.