I am yet getting another error...
Data type mismatch: format other than LIST or DATE being referenced as a relation
Anyone what this mean?
It means in your formula, the mapping has to be on LIST or DATE formatted line item. As of now it could be Text, number, Boolean but not those two. Try changing the format of your mapping line item
Hope that helps
This is because the mapping items that you are using in your formula are not LIST or DATE formatted but for the formula to work it should be LIST or DATE formatted.