TypeDescriptor with Name '{0}' and Id '{1}' needs exactly {2} child TypeDescriptors tagged with the {2} Identifiers for Entity ...

TypeDescriptor with Name '{0}' and Id '{1}' needs exactly {2} child TypeDescriptors tagged with the {2} Identifiers for Entity (External Content Type) with Name '{3}'. However, the metadata has {4} such TypeDescriptors tagged.