I have a table with a number of Calculated Fields that originate from other Entities through relationships and edges. Some of these are based on 1:1 relationships, and others on 1:many. While all of them are visible in the grid View, only the ones based on 1:many relationships are visible in the Schema Editor. Consequently, the ones based on 1:1 relationships cannot be selected for plotting in the Chart widget of a Form view.
I find this peculiar since calculation of the values irregardless of the type of relationship appears to work fine, the values are all there in the grid view.