How to update parent field from child using SIL post function script.

[vishal]

Hi Guys,

i am trying to update the parent(customfield_10031) field from child subtask but its not getting updated.

if(isNotNull(parent))
{
description = "Testing";
customfield_10033 = currentDate() + "4d";
}

if(status == "CLOSED")
{
labels = "my label";
}
else if(customfield_10033 != "")
{
string issue_parent_Key = key;
%issue_parent_Key%.customfield_10031 = "False";
}

what is wrong in the above code?