The following snippet of code isn't doing what I hoped it would do. After it runs the subject spreadsheet cell does not have a conditional format. What am I doing wrong? $WS is an Excel worksheet. $i is a row number. 
use Win32::OLE::Const 'Microsoft Excel';
[...]
$WS->Cells($i,11)->FormatConditions ->Delete;
$WS->Cells($i,11)->FormatConditions->Add(xlExpression,,
   "=AND(J$i>0,K$i=0)");
$WS->Cells($i,11)->FormatConditions(1)->Interior->{ColorIndex}=
   xlYellow;
[...]

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I have also tried, for the second line, 
$WS->Cells($i,11)->FormatConditions->
   Add({Type} => xlExpression,{Formula1} => "=AND(J$i>0,K$i=0)");

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and also 
$WS->Cells($i,11)->FormatConditions->Add(xlExpression,
   undef,"=AND(J$i>0,K$i=0)");

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A Macro to do what I want produces code that looks very much like what I've coded. Help!

In reply to excel conditional formatting by ArtYaffe

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