There is an error in the TypeDescriptors of Parameters on Method with Name '{0}' on Entity (External Content Type) with Name ...

There is an error in the TypeDescriptors of Parameters on Method with Name '{0}' on Entity (External Content Type) with Name '{1}' in Namespace '{2}'. The TypeDescriptors incompletely define where the Foreign Identifiers of Entity '{3}' in Namespace '{4}' are to be read. That Entity expects exactly '{5}' Identifiers, but only '{6}' TypeDescriptors with the correct Association were found from which to read them.