Checkbox issue in module pool program

Hi all,

I have a small issue in a module pool program using checkboxes. The requirement is that my basic list should contain the data with checkboxes and as per the selection by the user, the selected records should appear in the next screen (secondary list). But after selection, all the records barring the last record is appearing in my secondary list. Below are the screenshots of my program:

These are the global variables I declared:

The layout for the  basic list is as shown. The function code is cbox for checkbox.

The flow logic :

The code for user-command:

Now on executing the program,

As you can see, sales orders 4970,4972,4974 and 4975 are selected. So after clicking NEXT, in the secondary list , the data for these selected sales orders from VBAP table should come up. But instead, the records from 4970, 4972 and 4974 are displayed except the last sales order which is 4975.

This is happening for all the records. The last selected sales order is not getting selected. Why is it so?

Thanks.

Manish