How to underline in ALV reports

Question: I'm using function module REUSE_ALV_HIERSEQ_DISPLAY.
I want to print an underline when the value of a field changes.

So I setted the fields SPOS, FIELDNAME, TABNAME, UP and GROUP of table parameter IT_SORT. In particular the field GROUP is setted to 'UL'. But I don't see any underline.
Is there any other parameter to set ?

Any help is greatly appreciated.

Antonino

Answer:
Hi,
I could not log into SAP right now, but I think you should find the parameter to add underline either in LAYOUT parameter or in FIELD CATALOGUE parameter. I don't think the SORT parameter is the correct one to set...
Hope this help...

Rgrds,
Jeffrey
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