[otrs] : error executing the otrs.ITSMChangeDelete.pl procedure

Hi I catched following error using the otrs.ITSMChangeDelete.pl (the real procedure that output the error is otrs.ITSMChangesCheck.pl) - (OTRS 3.0.8, ITSM 3.0.3) Can't locate package Kernel::System::ITSMChange::Number::BIDateChecksum for @Kernel::System::ITSMChange::ISA at /opt/otrs/Kernel/System/ITSMChange.pm line 101. depite the errors the changes I want to delete are really deleted. BIDateChecksum module is a custom module that creates a custom Change id string. It works fine and the module is into the right directory Kernel/System/ITSMChange/Numbers what's the problem ? best regards -- * Stefano Boccanera*