Adding conditions in patter extension

[lmundere]

Hi,

I have added an extension in the Windows OS pattern, where I want to populate a custom field called Full OS Build, and it works well, however in small percentages sometimes the result returns null and in that case I would not want to run the transformation, I have added the following in my condition: 

But still doesnt seem to work, any idea? 

[Kieran Anson · Accepted solution]

Rather than specifying the row with a 1, leaving the content of the square brackets empty 

$f_details[].d_version

[lmundere]

Thanks Kieran, let me try that and see.