Invalid data type

// assembly
USING Infragistics.UltraChart.Data.Series.ISeries.

// variable where error is......
DEFINE PRIVATE VARIABLE series1  AS  NumericSeries NO-UNDO.

USING Infragistics.UltraChart.Resources.Appearance.*.

DEFINE PRIVATE VARIABLE series1  AS  Infragistics.UltraChart.Resources.Appearance.NumericSeries NO-UNDO.

METHOD PRIVATE VOID InitializeChart():
      
    DEFINE VARIABLE qc as HANDLE  NO-UNDO.
    DEFINE VARIABLE i  as INTEGER NO-UNDO.
  
    SESSION:APPL-ALERT-BOXES = TRUE.
    DO i = 1 to 20:
    CREATE tt.
      ASSIGN
        tt.pb-acost = "i" + STRING( i )
        tt.pb-partno = i
        tt.sys-cono = RANDOM( 1, 100 )
        tt.pb-partno = RANDOM( 1,  10 ).
      
    END.
Now I'm getting a different error on this method. What am I missing on this method..?

// temp-table

    DEFINE TEMP-TABLE tt NO-UNDO
    FIELD sys-cono AS CHARACTER
    FIELD pb-partno AS CHARACTER
    FIELD pb-acost AS DECIMAL
    FIELD pb-onhand AS INTEGER
    INDEX xIdx IS PRIMARY UNIQUE sys-cono.

Incompatible data-type expression line 167

DEFINE TEMP-TABLE tt NO-UNDO
    FIELD sys-cono AS INTEGER
    FIELD pb-partno AS INTEGER
    FIELD pb-acost AS CHARACTER
    FIELD pb-onhand AS INTEGER
    INDEX xIdx IS PRIMARY UNIQUE sys-cono.