FI_GL_4 data source issue

Hi,

I'm loading data in to FIGL_O02 ODS using FI_GL_4 data source. I used driect mapping and there is no code my start/update routines on any key figures. I noticed some of my key figures (DMBTR WRBTR MENGE) revesals are not updated correctly where as other key figures ( DEB_CRE_LC DEB_CRE_DC ), have reversals,so we have wrong Qty and Amount values. Is there a know issue with this data source or do I need to write any logic to pull these reversal values? Please advice.