How do i get a value from a custom field in SIL

[Willyam Mudingayi Malumba]

Here my code i'm trying to acces a customfield value but i'm having an error

string[] parentIssuekeys = linkedIssues(issuekey,"Link",1);

string highestSeverity = "None";

for(string parentIssuekey in parentIssuekeys) {

string parentSeverity = %parentIssuekey%.#{Severity};

}

%issuekey%.#{Severity} = key.#{Severity};