Bracketed calibrations in OpenLab Chemstation - blanks before the first standard

I need to build a sequence in OpenLab Chemstation that uses a bracketed Calibration, but need the first two injections to be blanks.  The Chemstation sequence table reports an error because there are injections outside of the bracket. 

Since this is possible in OpenLab CDS, I'm wondering if I'm missing something in Chemstation?

Thanks

Andy