RPL data directive evaluating blank

Hi, everyone.

I'm attempting to leverage the data directive in RPL to match a copy variant to subscribers based on a number assigned in a SQL view. My RPL looks like this:

<#data MySuppTable as variant><#filter SPLITNUMBER=VARIANTNUMBER><#fields SUBJECTLINE>${variant.SUBJECTLINE}</#data>

However, it keeps evaluating to a blank subject line even when I have verified the subscriber in question has a number assigned in the SQL view that matches the variant number.

Could someone perhaps let me know what I'm doing wrong?

Thank you so much!