I have a IG with a DA with javascript code

var i, selectedIds = "",

model = this.data.model;

for ( i = 0; i < this.data.selectedRecords.length; i++ ) {

selectedIds += model.getValue( this.data.selectedRecords[i], "DECA");

}

$s("P134_NR", selectedIds);

It works perfectly for IGs without the multiselect option checked. How to modify the code I paste to set an item value with the latest checked row?