Error with relationshiptype configuration not reported in API Relationship

I have configured a relationshiptype between Person and Person. That was incorrect as I wanted to create one from Person to Household, but I did not notice my mistake at first. I then used an import script to load demo data into CiviCRM 2.2. To load relations I use the relationship API:

// Parameter array voor CiviCRM API om relatie toe te voegen:
$params = array(
'contact_id_a' => $civicrm_id,
'contact_id_b' => $relatie_id_b,
'relationship_type_id' => $relationship_type_id,
'start_date' => $vandaag,
'is_active' => 1
);

// Aanroepen CiviCRM API functie om relatie toe te voegen:

$relatie = & civicrm_relationship_create( $params );
if( civicrm_error( $relatie))

{ $fouten[$i] = "Fout bij relatie leggen van contact : ".$civicrm_id." naar contact : " .$relatie_id_b." : ". $relatie['error_message']; $i++; }

The data I loaded tried to set up a relationship between a Person and a Household. The API did not add this relationship, which was correct as I configured it to be from Person to Person. However, I did not receive an error from the API. I simply did not do the create relationship and moved on without message. I did find my mistake in the configuration later, but I think there should have been an error message, telling me it there was a conflict with the configuration of the relationship type.