Function that zero out negative forecast in APO DP (SCM 4.0)

Hi,
  I tried to look for a thread about the above function but I have no luck.  Would you kindly share a light if you have come accross negative number being generated automatically? (no macro is set up for negating forecast)
This is the note that I would found from SAP help, but there is no actual direction to get it.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/d5e13ffb118f15e10000000a155106/frameset.htm
Thanks
Anita

it depends on the forecast strategy used....negative forecasts are automatically made zero by most strategies
some forecast strategy will generate negative forecasts ( am not sure which of them do).. but in that case you can use a macro to make it zero
I did not understand if you wanted Negative forecast or you want to zero out the negative ones
pl check link... http://help.sap.com/saphelp_nw04/helpdata/en/a4/42e03fc2269615e10000000a155106/content.htm
SCM 5.0 has Planning area parameters that will enable you to not allow non-sero numbers in KF

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