FPL9's Line Item Description (Part 1)

SAP get the line item description via FM 'ISU_ACC_DISP_BASIC_LIST_1205'

Program: SAPLFKL9
Include Program: LFKL9FS0
Form: SELEKTION_AUSFUEHREN_END

Then,

Program: SAPLFKL9
Include Program: LFKL9U08
Function: FKK_LINE_ITEMS_ADD_INFORMATION