REUSE_ALV_GRID_DISPLAY and the OUTPUTLEN option

I'm trying to limit the output length of a field while using REUSE_ALV_GRID_DISPLAY by changing the OUTPUTLEN parm. But it doesn't matter what value I place in there, the output length is always the same as the dictionary domain length.

I also tried ddic_outputlen without luck. Altering ref_fieldname and ref_tabname seems silly.