Suspension constraint not working during registration

[maxsibilla]

The entity constraints works properly in identifying that a Suspension can be registered to a Blood Organ
POST https://entity-api.dev.sennetconsortium.org/constraints
body:

[{"ancestors":[{"entity_type":"Sample","sub_type":["organ"],"sub_type_val":["Blood"]}]}]

When registering the sample it fails though

POST https://entity-api.dev.sennetconsortium.org/entities/Sample
body:

{"group_uuid":"57192604-18e0-11ed-b79b-972795fc9504","direct_ancestor_uuid":"52e042ae14b7a5b7297e1f32cd90aa32","sample_category":"Suspension","protocol_url":"dx.doi.org/10.17504/protocols.io.3byl4j398lo5/v1","lab_tissue_sample_id":"Paired Tag Suspension"}