SCM changes per build definition

Hi All,

Today, when a project gets two (or more) build definition like theses:
1/ Default build - scheduler HOURLY_SCHEDULE - no fresh build - set as default
2/ Site and/or Q/A build - scheduler NIGHTLY_SCHEDULE - no fresh build

> the first build def. is run every hour if a scm change is found since its last build (last hour)
> the second build def. is run every night if a scm change is found since its last build (last night)

During day, scm changes appears normally in every hour build results: for each build, we can see respective scm changes.

Problems appear at night:
All scm changes appearing previously on hourly builds have moved to the nightly build result; no more scm change appear on build results of the day before.

A workaround is to flag "build fresh" to "true" for the nightly build def. Thus, no scm change will be detected. But, as "build fresh" implies "always build", a nightly build is run even without scm change.

Could it be possible to have scm changes per build definition or is there another workaround ?

Regards,
Nicolas