DST ABSOLUTE does not work as expected

I'm reading a value minutes of sunshine in the past 10 minutes, which can vary between 0 and 10 and gets read every 10 minutes.

So I created an rrd with a DST ABSOLUTE, because the source always starts at 0 after each period, expecting the value in the RRD to be like 10,20,30,40,50,60 for a full hour of sunshine.

Data reading is fine:

ds[sunshine].index = 1

ds[sunshine].type = "ABSOLUTE"

ds[sunshine].minimal_heartbeat = 1200

ds[sunshine].min = 0.0000000000e+00

ds[sunshine].max = 1.0000000000e+10

ds[sunshine].last_ds = "10"

ds[sunshine].value = 0.0000000000e+00

ds[sunshine].unknown_sec = 0

But in the rrd itself I get weird values:

<!-- 2015-03-28 08:50:00 CET / 1427529000 --> <row><v>1.6666666667e-02</v></row>

<!-- 2015-03-28 09:00:00 CET / 1427529600 --> <row><v>1.6666666667e-02</v></row>

<!-- 2015-03-28 09:10:00 CET / 1427530200 --> <row><v>1.6666666667e-02</v></row>

(1.666e-02 is 1/60 btw.)

What point am I missing?

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