unusual error with proc X12

[captainprice0]

I am getting following error while using an exogenous variable with X12.

I cant post the code here

any guesses with that may be the reason?

"ERROR: Starting date for the span of the data, . , must begin on or after the starting date for user defined regression
variables, JAN1960."

[TammyJackson]

The span of any user-defined regression variables should include the span of the series to be seasonally adjusted, including backcasting or forecasting. For example, suppose that your user-defined regression variable has a span of [01JAN2017,31DEC2017], but your series has a span of [01JAN2016,31DEC2018], then the span of the data begins BEFORE the span of the regression variables.

[Reeza]

My guess - you have a mismatch of types between date and datetime.