"'P1 Product Families' is not recognized as a hierarchy in the model."
i am getting this error
Are you strictly typing this in your formula ?
"'P1 Product Families'
If yes then you have a " too much
if no, it means you have no list called P1 Product Families
Looks like the formula is not able to identify the hierarchy.
Could you please help us with the formula you trying to write along with the 'P1 Product Families' list (list name)?