CL_SALV_HIERSEQ_TABLE problem Column Quantity format (MENGE)

Hi.

I'm using CL_SALV_HIERSEQ_TABLE hierarchical and I have a quantity colum type MENGE.

This colum in transparent table has decimals (domain is MENG13) but the ALV Tree shows just the integer part of it.

How can I format it to print also the decimals ?

thank you in advance.