Even more info on the solution. The value of ® was "td easter." This is an acceptable spec for regression inder the aictest if you are using Census' Win X-13. I was interpreting that as being an acceptable spec for SAS proc X13 for predefined regression. However, the X13 manual from SAS clearly states https://support.sas.com/documentation/onlinedoc/ets/141/x13.pdf "The predefined regression variables, EASTER, LABOR, SCEASTER, SINCOS, TDSTOCK, and THANK, require extra parameters." "regression predefined=easter(7) easter(14);" This was the real problem. I needed to be more specific about which easter to use.
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