question: public FactLine createLine ( DocLine docLine , MAccount account , int C_Currency_ID , BigDecimal Amt ) { if ( Amt . signum ( ) < 0 ) return createLine ( docLine , account , C_Currency_ID , null , Amt . abs ( ) ) ; else return createLine ( docLine , account , C_Currency_ID , Amt , null ) ; }
target:  Create and convert Fact Line. Used to create either a DR or CR entry