Every time we rebuild the order balance with error recovery session "Rebuild Customer order balance" (tccom2210m000) there are customers with a big difference.
Can anyone point out where the differences could come from?

PS: we are running baanIV sp9

As the menu description name suggest 'Error recovery' , these differences stems either from Baan standard program error or some program interruptions or inconsistent customization/localizations or remotely due to some inconsistent GTM.