Transaction SLG1 provides information on what was changed in the Master Data table of an infoobject.
Use these values for
Object – RSDMD
Subobject – MD_UPDATE
External ID – MDMT*( Infoobject )
(Note that there should be a space before and after the infoobject name within brackets)
Additionally, other filters on date, time, username etc.,. can be used.
This is how the logs look like. They can provide the information needed.