On Update : Lookup error...

On Update : Lookup error...

Hello ZC Team,
 
I have a problem trying to call a function on a lookup field, I can sucessfully invoke and use on the user Input action but when I try to use same code on the "On Update" action I'm having problems:
 
My code on de User Input is:
 
list = base_de_curriculums.gconsu.gclistaconsultores(input.Skill_Disponible);
Nombre_Consultor:ui.add(list);

This is working very nice-
 
Now I want same but in on Update, message error say" was expecting append, I change add by append and message say  invalid task.
 
Code on the update:
 
list = base_de_curriculums.gconsu.gclistaconsultores(input.Skill_Disponible);
input.Nombre_Consultor:ui.append(list);

 
Thanks a lot.