Where can i change DTP Package Size?

Hi

In BI, whenever i create DTP it shows Package size = 50,000 by default (in DTP-> Extraction Tab). I don't know where is it source from?

Actually i can control Data Source package size from T-Code = RSCUSTV6. But don't know where can i control package size at DTP level.

BTW I am not using R3 system and all the things loading from Flat files. I checked SBIW for this, but found no entries in R3 as well in BI side.

Pls. let me know if u have some idea...

Thanks...