Passing parameter as a range

Hello all,

I have a small issue in my requirement. I have the following selection screen in my report and I had to put drop downs as shown:

Now the drop downs are  parameters and not select-options as shown below :

I am populating the drop down for the username using the FM VRM_SET_VALUES as shown:

Now, the main issue that I have is that I need to pass the username from the drop downs as a range in a custom function module.

This is the approach I took:

I created a range table:

I appended the values:

However, on debugging I can see the the parameters I3_CASH and I2_CASH are not holding any values at all.

So the range table LT_USNAM2 passed to the FM  is empty

So can anyone please help me out as to how to populate the range table so that I can get the higher and lower values and append them so they can be passed to the FM ?

Regards,

Manish