对中美贸易进出口2005-2017月度原始数据（未进行对数转换）进行季节调整，采用ARIMA(0 1 1)(0 1 1)乘法模型，出现了如下问题：
ERROR: Multiplicative or log additive seasonal adjustment cannot be performed when preadjustment factors are derived from a regARIMA model for data which have not been log transformed.
Check the values for the power or function arguments of the transform spec and mode of the x11 spec.

求问各路大神，该如何解决？
我试了下加法模型能得到调整后数据也通过检验，这是为什么？