Complex Calc Formula Not Working

Summary

Essbase Formula not working

Content

I have a formula in a calc script that is not working if its embedded in a Fix and If statement. Hoping someone can provide some insight.

The code as is will set Volume to #MISSING. If I change the formula to hardcode it to "YTDJan" it works as I expect. If I use the same formula outside of the Fix/If statements it works so I don't think the syntax in the formula is the issue.

Thanks in Advance!

Code Snippet

FIX(@RSIBLINGS(&FFY), "Jan":"Dec")
"New"(
 IF (@ISMBR("Jan"))
   "Volume"= "Loaded Volume"->@MEMBER(@CONCATENATE("YTD", @NAME(@CURRMBR("Period"))));
 ENDIF
)
ENDFIX