I've an animated sphere which is transferring Cd to a deforming
grid. I connected grid to Input1 and sphere to Input2 of solver SOP.
Inside sop solver, I connected Prev_Frame to first input of attribtranfer SOP and Input_2 to second input.
Now it's obvious that I’m going to loose deformation of grid because Prev_Frame is calculating
Rest position of Input1(deforming grid).
I know the problem but don’t know how to fix it.

I got it. I transfered the color from the previous frame grid (Prev_Frame) to the current frame grid (first input). Just using an extra attribute transfer.