Setting the last-line-end-indent property to a negative value is treated the same as setting it to 0, but the FO spec clearly states it should produce an outdent.
Can you please provide a testfile (FO, not XSLT) that demonstrates this? We have a test case that tests using negative values and that looks fine. Maybe it's some strange combination that doesn't work.
I have been unable to reproduce the bug, so I will close it. I suspect I misunderstood what I was seeing previously.
batch transition to closed remaining pre-FOP1.0 resolved bugs