jQuery Grid Plugin - jqGrid

I have a grid with 10 to 15 column in those except 3 columns all other columns are editable and in the grid only one row will be edittable.

For the above requirement I have applied cellEditable to true.

and I am manually checking whether I am editting the edittable row or not in the "afterEditCell" call Back function.

Here I am facing some issue like, while editting a cell,[means input is visible in the cell], when I update that row [using setRowData menthod] then grid is becoming non edittable.

Help me in the above context.