Buscar
$.jgrid.getAccessor(U,f)
y cambiarlo por 
$.jgrid.getAccessor(U,f)||$.jgrid.getAccessor(U,o.id)
dos veces.

Buscar 

:"gs_"+O.

agregar después de search

,autocomplete:"off","class":"dontUpperCase" + (this.formatter == "number" || this.formatter == "currency" || this.sorttype == "number" ? " auto auto_neg" : "")