Find null values and replace with next row's value+10

Hi,

BO Data Services Version: 4.1 SP2

I have (.CSV) file as source. It has integer values for some combinations and it doesn't have any value for few combinations. i.e. some combination don't exist in the file. I want to replace the null values into some value or next row's value + 10.

How can I achieve this? Any help is much appreciated.

The data in the file looks like the below:

Expected result: (Formatted in Bold Italic)

Thanks,

Jeni