yea, this works as intended on like, 2000 records:
UPDATE sndbasis SET sndbasis.rollingsum = DSum("[req]","sndbasis","[cldate]<=#" & Format([cldate],"mm/dd/yyyy") & "# and [PSTK] = '" & [pstk] & "'");
in about 10/15 seconds, so ovbiously with 200k it fails hard - i think it has issues with...