SPAU after Upgrade

Hi Gurus

We sucessfully completed the upgrade process from R/3 4.7 to ECC 6.0 , But our Ababers told me , the Purchase Order raising gives error like . So kindly tell me any post upgrade steps are neccesarry for Upgrade like SPAU . If i want to run SPAU means , kindly tell me steps for using SPAU .

Regards

PalaniSel