multigraph and DERIVE not working for root plugin..

[savar]

When u're trying to create a multigraph with this

multigraph daybudgets
graph_title daybudget for campaigns
graph_args --base 1000
graph_period minute
graph_vlabel daybudget change per ${graph_period}
graph_category something
graph_info This graph shows the growth of the daybudget over all domains

overall.label euro
overall.info Overall daybudget change per ${graph_period}
overall.type DERIVE
overall.draw LINE1
overall.min 0

multigraph daybudgets.campaigns_1_2
graph_title Daybudget of campaigns 1 2
graph_args --base 1000
graph_period minute
graph_vlabel daybudget change per ${graph_period}
graph_category something
graph_info This graph shows the growth of the daybudget of some campaigns.

campaign1.label 1
campaign1.info Daybudget change per ${graph_period}
campaign1.type DERIVE
campaign1.min 0
campaign1.draw LINE1
campaign2.label 2
campaign2.info Daybudget change per ${graph_period}
campaign2.type DERIVE
campaign2.min 0
campaign2.draw LINE1

the root graph won't be created (but the daybudgets.campaigns_1_2 will!)
the rrd file seems to be correct only in munin-graph there seems to happen something stupid because i saw many DEF:icampain1 ... when it was trying to generate the root graph:

rrdtool 'graph' '--font' \
        'DEFAULT:0:DejaVuSans' \
        '--font' \
        'LEGEND:7:DejaVuSansMono' \
        '-W' \
        'Munin 1.4.5' \
        '/var/www/munin/example.com/s1.example.com/daybudgets-day.png' \
        '--title' \
        'daybudget for campaigns - by day' \
        '--start' \
        '-30h' \
        '--base' \
        '1000' \
        '--vertical-label' \
        'daybudget change per minute' \
        '--height' \
        '175' \
        '--width' \
        '400' \
        '--imgformat' \
        'PNG' \
        '--lazy' \
        'DEF:acampaign1466=:42:MAX' \
        'DEF:icampaign1466=:42:MIN' \
        'DEF:gcampaign1466=:42:AVERAGE' \
        'DEF:acampaign1509=:42:MAX' \
        'DEF:icampaign1509=:42:MIN' \
        'DEF:gcampaign1509=:42:AVERAGE' \
        'DEF:acampaign1407=:42:MAX' \
....
....
.... and many more of this DEF:'s and then:
        'DEF:aoverall=/var/lib/munin/example.com/s1.example.com-daybudgets-overall-d.rrd:42:MAX' \
        'DEF:ioverall=/var/lib/munin/example.com/s1.example.com-daybudgets-overall-d.rrd:42:MIN' \
        'DEF:goverall=/var/lib/munin/example.com/s1.example.com-daybudgets-overall-d.rrd:42:AVERAGE' \
        'CDEF:acdefoverall=aoverall,60,*' \
        'CDEF:icdefoverall=ioverall,60,*' \
        'CDEF:gcdefoverall=goverall,60,*' \
        'CDEF:ccdefoverall=gcdefoverall' \
        'CDEF:min_max_diff=acdefoverall,icdefoverall,-' \
        'CDEF:re_zero=min_max_diff,min_max_diff,-' \
        'AREA:icdefoverall#ffffff' \
        'STACK:min_max_diff#22ff22' \
        'LINE2:re_zero#000000' \
        'COMMENT:            ' \
        'COMMENT: Cur\:' \
        'COMMENT:Min\:' \
        'COMMENT:Avg\:' \
        'COMMENT:Max\:  \j' \
        'LINE1:gcdefoverall#00aa00:euro         ' \
        'GPRINT:ccdefoverall:LAST:%6.2lf%s' \
        'GPRINT:icdefoverall:MIN:%6.2lf%s' \
        'GPRINT:gcdefoverall:AVERAGE:%6.2lf%s' \
        'GPRINT:acdefoverall:MAX:%6.2lf%s\j' \
        'CDEF:ccampaign1826=gcampaign1826,POP,UNKN' \
        'CDEF:ccampaign1827=gcampaign1827,POP,UNKN' \
        'CDEF:ccampaign1828=gcampaign1828,POP,UNKN' \
        'CDEF:ccampaign1819=gcampaign1819,POP,UNKN' \
        'CDEF:ccampaign1825=gcampaign1825,POP,UNKN' \
....
....
.... and many more of this CDEF:'s

the only chance was at the moment to switch in the root graph to GAUGE and calculate the derive by myself.. the DERIVE in the subgraphs are working like expected...