When publishing a master report with one subreport you are prompted to change the relative path to "repo:" during the upload process. However when you publish a master report that has a nested subreport (subreport has a subreport) that nested subreport does not get it's relative path changed. Result is on JS when viewing report it can not find the subreport's subreport. Uploading the first subreport manually works because it's seen as a master and the nested subreport is changed to "repo:".
Did you manage to get a solution for this?