MdxScript (Sales) (1890,3) Calculation error in measure.

Anonymous 
Perhaps the same column name is used for another column in another table which makes it impossible for the engine to identify which is which without specifying the table name. The standard is to specify the table name along with the column name when referencing a column and not to include the table name when referencing a measure. Please try

TranspoKarton =
IF (
    [WarrantyLimit1] = 0,
    SUM ( 'Dim_Product'[Measurement1] ) * 'Sales'[InvoicedQty],
    IF (
        LEFT ( [Meter3], 4 ) = "TRAB",
        SUM ( 'Dim_Product'[Measurement3] ) * 'Sales'[InvoicedQty],
        0
    )
)