email templates not able to use variables in the subject line?

[Summy]

I've got an invoice template with {invoice_num} in the subject line, so that it helpfully displays the invoice number for the customer without them having to open it.

 

On signing up/trying to send an invoice the following error appears in my php error_log file:

 

[09-Mar-2009 15:12:41] PHP Fatal error: Smarty error: [in emailtpl:emailsubject line 1]: syntax error: unrecognized tag 'invoice_num' (Smar

ty_Compiler.class.php, line 583) in /home/username/public_html/libs/Smarty.class.php on line 1095

 

So am I right in thinking that I can't have merge fields in the subject line?

 

If not, can we put this in as a feature request please? Having 10 or so emails in a folder with the subject "Your new invoice", isn't very helpful.

[Summy]

nevermind I see that I am missing the '$' character. Please delete this thread!