The problem you have is not related to vCO but to vCloud Director. You can fix it the following way (information from a collegue that was helful solving this problem before) :
You can update the setting by adding the following to global.properties:
restapi.security.request.max_allowed_elements=16384
restapi.security.request.max_allowed_depth=200
There is also a way to put this in the database so that all cell's in the vCD Server Group use the same setting:
INSERT INTO config (config_id, cat, name, value, sortorder) VALUES (seq_config.NextVal, 'vcloud', 'restapi.security.request.max_allowed_elements', '16384', 0);
INSERT INTO config (config_id, cat, name, value, sortorder) VALUES (seq_config.NextVal, 'vcloud', 'restapi.security.request.max_allowed_depth', '200', 0);
you can update the database settings after the fact by:
UPDATE config SET value='8192' WHERE name='restapi.security.request.max_allowed_elements';
UPDATE config SET value='8192' WHERE name='restapi.security.request.max_allowed_depth';