doubt about report FBL5N of screen field:Open items and Cleared items

hi

i know the report FBL5N is use DDF LDB and the report work flow is BSID->BKFP->BSEG

but i don't know to differentiate Open Items and Cleared items in this report.

Open items and Cleared items stand for a field flag in these table (BSID,BKFP,BSEG )? if true the field is?

or they must be calc in program ? if true what about calc rules?

waiting for help! thank you!