=load(
local!nullValue: null,
a!sectionLayout (
	  label:"Event details",
	  firstColumnContents: {
		
		a!checkboxField(
		  label: "Printing",
		  labelPosition: "ADJACENT",
		  required: false(),
		  disabled: false(),
		  choiceLabels: cons!PRINTING_LABELS_VALUES,
		  choiceValues: cons!PRINTING_LABELS_VALUES,		  
		  value: if(ri!isEdit, ri!chkBoxvalues, local!nullValue)
		  saveInto: ri!chkBoxvalues		  
        ),
		a!radioButtonField(
		  label: "Dietary requirements",
		  labelPosition: "ADJACENT",
		  required: false(),
		  disabled: false(),
		  choiceLabels:{"Yes","No"},
		  choiceValues: {1,0},
		  value: ri!drpDwnValue ,
		  saveInto: ri!drpDwnValue
		)
	  }
	 )
)

-----------------------------

-> PRINTING_LABELS_VALUES is a multiple Text constant with value Foyer Signs;Placecards;Name tags
-> ri!chkBoxvalues is multiple text parameter which i am passing from process model (initially it will not contain any value)
-> ri!isEdit is boolean intially false

For suppose consider the scenario that i am selecting 1st and last option in the checkboxes (i.e., Foyer Signs;Name tags)

Issue1:  when i select some value in the radio button below, checkboxes selected seems to be unselected but after sumit, "chkBoxvalues" multiple text variable contain value "Foyer Signs;Name tags" in process model

Issue2:  when it comes back to the same form with isEdit true, it throws the following error in the server log
"2015-05-12 11:35:32,569 [ajp-/0.0.0.0:8009-12] ERROR com.appiancorp.rest.shared.AppianExceptionMapper - Internal Server Error on REST API invocation.
com.appiancorp.process.expression.ExpressionRuntimeException$AppianExceptionProvider: Expression evaluation error in rule 'chekbxtest' (called by rule 'chkbxtest'): A checkbox component [label=“Printing”] has an invalid value for “value”. All selected values must be present in the choiceValues array, but value was  and choiceValues was Foyer Signs; Placecards; Name tags. (APNX-1-4198-000)"