getItemAvailability returning: "An unexpected error occurred."

Hi,

getItemAvailability stopped working for me this past week, and I'm trying to track down the cause. Any call I make to getItemAvailability comes back with the message: "An unexpected error occurred."

Here is my Java code:

// Create item ref
RecordRef itemRef = new RecordRef();
itemRef.setInternalId( xRef.netSuiteInternalID() ); // This NS item exists
itemRef.setType( RecordType.inventoryItem );

// Create RecordRef list
RecordRef[] recordRefs = new RecordRef[1];
recordRefs[0] = itemRef;
RecordRefList recordRefList = new RecordRefList();
recordRefList.setRecordRef(recordRefs);

// Create item filter
ItemAvailabilityFilter itemAvailabilityFilter = new ItemAvailabilityFilter();
itemAvailabilityFilter.setItem( recordRefList );

GetItemAvailabilityResult result = port.getItemAvailability( itemAvailabilityFilter );
if ( !result.getStatus().isIsSuccess() ) {
throw new RuntimeException( "NetSuite Error: " + result.getStatus().getStatusDetail(0).getMessage() );