Hello,
did you check /SAPSRM/CL_CH_WD_XO_MAPPER /SAPSRM/IF_CLL_XO_MAPPER~FIRE_EVENT_UPDATE method from /SAPSRM/CL_CH_WD_XO_MAPPER class?
OSS note 1895112 - Performance improvement in Tracking tab added new method DETERMINE_TRACKING_REFRESH: maybe, there is an error in ABAP code provided by SAP.
Regards.
Laurent.