Well I found my answer 🙂
As "code.matrixcellvalue" is a custom It needs to add the following script to the
Report Property -> code
Public Function MatrixCellValue(ByVal sumValue As Object, ByVal avgValue As Object, ByVal InScope As Boolean, ByVal sumFormat As String, ByVal avgFormat As String) As Object
If InScope Then
Return sumValue
Else
If Not avgValue Is Nothing Then
Return String.Format(sumFormat, CDbl(sumValue)) + vbCrLf + String.Format(avgFormat, CDbl(avgValue))
Else
Return Nothing
End If
End If
End Function