How do I update an instance with a unique field that hasn't changed in Grails?

I am having a problem while trying to update an instance with a constrained field: unique, but has not been modified.

https://grails.github.io/grails-doc/latest/ref/Constraints/unique.html

class SectorEmpresarial{
    Long codigo
    String nombre

    static constraints = {
        nombre  nullable: false, size: 0..50, unique: true
    }
}

      

        
        
        
      

    

Example:

• Created instance

  def sectorEmpresarialInstance = new SectorEmpresarial(codigo:1,nombre:"MY_NAME")
  sectorEmpresarialInstance.save(flush:true)
  
        
  
          
          
          
        
  
      

• Editing instance (here ERROR)

  / * params = (codigo: 2, nombre: "MY_NAME"), see that nombre hasn't changed * /

  def sectorEmpresarialInstance = SectorEmpresarial.findByCodigo(1)
  sectorEmpresarialInstance.properties = params 
  sectorEmpresarialInstance.save(flush:true) // Here present error because nombre has constraint: unique.