SAIL Code :

load(
  local!user,
  a!pickerFieldCustom(
		label: "Manager",
		labelPosition: "ADJACENT",
		maxSelections: 1,
		suggestFunction: rule!Test_ucArrayPickerFilter(
		  inputName: _
		),
		selectedLabels: if(
		  count(
			local!user
		  ) = 0,
		  null,
		  index(
			rule!Test_ucArrayPickerFilter(
			  inputName:_
			).data,
			wherecontains(
			  tostring(
				local!user
			  ),
			  touniformstring(
				rule!Test_ucArrayPickerFilter(
				  inputName: _
				).identifiers
			  )
			),
			{}
		  )
		),
		value: local!user,
		saveInto: {
		  local!user
		},
		required: true
	  )
)


rule!Test_ucArrayPickerFilter :

with(
  local!queryData: if(
    len(
      ri!inputName
    ) >= 3,
    rule!Test_getManagerDataByQueryEntity( /*This rule return Manager FN , LN and id*/
      ri!inputName
    ),
    {}
  ),
  local!fullName: if(
    rule!APN_isEmpty(
      local!queryData
    ),
    {},
    apply(
      rule!Test_getMgrFN_LN,
      merge(
        index(
          local!queryData,
          "FirstName",
          {}
        ),
        index(
          local!queryData,
          "LastName",
          {}
        )
      )
    )
  ),
  local!datasubset: if(
    rule!APN_isEmpty(
      local!fullName
    ),
    'type!{http://www.appian.com/ae/types/2009}DataSubset'(),
    'type!{http://www.appian.com/ae/types/2009}DataSubset'(
      data: local!fullName,
      identifiers: index(
        local!queryData,
        "ID",
        {}
      )
    )
  ),
  local!datasubset
)


rule!Test_getMgrFN_LN :

concat(ri!firstName," ",ri!lastName)