Where an ObjectTypeAttributeDefinition is in use respect the ResourceOnly setting on contained types for add operations.

If an ObjectTypeAttributeDefinition contains an attribute definition that has ResourceOnly set then it should be filtered from the automatically generated description for the add operation.

This may be more related to lists, I currently have: -

ObjectListAttributeDefinition, which contains ObjectTypeAttributeDefinition, which contains SimpleAttributeDefinition

It is this final SimpleAttributeDefinition that has ResourceOnly set but it is still showing up in the operation description for add.