ASSERTION_FAILED on DropdownbyIdx

Question

Hi Gurus,
I need your help on this.
I encountered this error in Internet Explorer but not in Firefox and Chrome.
What happens is, when I triggered my dropdown by index, the column will have blank item first, then dropdown values.
Sample.
     Blank
     Value1
     Value2
When I click blank, nothing happens.
When I click Value1, Value2 got displayed.
When I click Value2, assertion_failed happens.
The error occurs in /1WDA/C0STANDARD==============CP=>IF_WDR_NW7_EVENT_HANDLER~HANDLE_EVENT.
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" Assert numeric value
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check IFUR_NW7_COMBOBOX~ITEMCOUNT > 0.
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assert value co '0123456789-'. "#EC NOTEXT
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lead_selection_index = value.
>>>>>
assert lead_selection_index >= 1 and lead_selection_index <= lines( mv_VALUE_SET ) or
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mv_WD_DESELECTABLE = abap_true and lead_selection_index = -1.
When I debug, at first pass on this code, mv_VALUE_SET has 3 items (blank, value1, value2).
On the next pass, mv_VALUE_SET has 2 items (value1, value2) only. The blank item was removed.
How to fix this error?

Answer 1

Hi Rama,
Yes. So far, only in IE.
It's weird because I only select a dropdown value ONCE and it passed through the program (/1WDA/C0STANDARD==============CP=>IF_WDR_NW7_EVENT_HANDLER~HANDLE_EVENT) TWICE.
The code that populates that dropdown is only in ON_DATA_CHECK because the dropdown's value is dependent on the adjacent column's value.
I put break-point in on_data_check.
It only passed through there once.
There's no other way, that I had repopulated that dropdown.