I am getting error 'Unknown source for data method. The method does not exist in data source or table.' while opening AX 7 form.
AX 7 is RTM VM. The form contains only one element which is a 'Chart'. The data source of the form & chart is an aggregate data entity. Form design has 'Hub part chart' pattern applied.
The same aggregate data entity is working fine when linked with another form which is just displaying the fields in a simple grid.