Sorry if I missed this in another post.
From the manual, it looks like %studyid and %seriesid use the same group/element?
%studyid=(0020,0010), %studyuid=(0020,000D), %seriesid=0020,0010), %seriesuid=(0020,000E), %sopuid=(0008,0018), %imagenum=0020,0013), %image=(0020,0013) as 6
digit integer, %imageid=(0054,0400)
Should it be %seriesid=0020,0011 - SeriesNumber? Looks to me like this is what dgate is using, looking at dgatefn.cpp source.