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I found the solution for this, essentially I didn't realise I could enter variables with the "?" structure in the common coefficients bit.

Heylo :) I'm running a pooled model sales, and some price variables are coming in +ve. I observed the series and found that for one pool it's because the series was in decline, and despite variability indicating a -ve correlation, the decline of the series gave an overall positive correlation. So to...