Why is this DMI method not working?

[Sytematic]

Hello, using SGWT PRO 3.0p


I have an add DMI method that must do an update operation in the case a row already exists, like so.

public DSResponse add(DSRequest req) throws Exception{
		//if already exists, do an update with the amount being added.
		
		DSRequest fetch = new DSRequest("Order__orderedDishes_Dish", "fetch");
		fetch.setRPCManager(req.getRPCManager());
		
		Map<String,Object> crit = new HashMap<String,Object>();
		crit.put("Package_id", req.getFieldValue("Package_id"));
		crit.put("Order__id", req.getFieldValue("Order__id"));
		crit.put("Dish_id", req.getFieldValue("Dish_id"));

		
		fetch.setCriteria(crit);
		
		DSResponse resp = fetch.execute();
		List data = resp.getDataList();
		
		if(data == null || data.size() == 0){
			logger.debug("doing an add, since there was no row found yet.");
			return req.execute();
		}
		else {// do an update instead
			logger.debug("doing an update instead of an add");
			Map rec = (Map) data.get(0);
			Integer orderedDishId = (Integer) rec.get("orderedDishes_id");
			
			DSRequest update = new DSRequest("Order__orderedDishes_Dish", "update");
			update.setRPCManager(req.getRPCManager());
			
			Map values = req.getValues();
			

			update.setFieldValue("amountOrdered", ((Long)values.get("amountOrdered")+(Long) req.getFieldValue("amountOrdered")));
			update.setFieldValue("orderedDishes_id", orderedDishId);
			update.setFieldValue("Package_id", req.getFieldValue("Package_id"));
			update.setFieldValue("Dish_id", req.getFieldValue("Dish_id"));
			update.setFieldValue("Order__id", req.getFieldValue("Order__id"));
			
			return update.execute();
		}
		
	}

the operationbinding making this happen:

 <operationBinding requiresRole="CAN_CREATE_ORDER__ORDEREDDISHES_DISH" requiresAuthentication="true" operationType="add" operationId="UpdateIfAlreadyExists">  
      <cacheSyncOperation>JoinOnPkg</cacheSyncOperation>
      <serverObject className="nl.sytematic.projects.CateringSoftware.server.custom.dmi.Order__orderedDishes_Dish_CustomDMI"/>  
       
    </operationBinding>

When the update is required because a row already exists, I use setFieldValue (also tried setValues) on the DSRequest to set all the fields. Somehow it is not picked up, getting the:

=== 2012-04-05 17:23:41,878 [l0-0] WARN  SQLDataSource - [builtinApplication.null] Insert, update or replace operation requires non-empty values; check submitted values parameter

I triple checked the values, and they are present.
Also i tried the approach where I put a complete map in using update.setValues(myMap)

The fields being added are all actual fields from the datasource.

Am I doing something wrong?

[Isomorphic]

See setFieldValue() JavaDoc - it tries to guess whether to place a value in criteria or not, with an empty "update" dsRequest all calls would go to criteria if no values have been added. Just use explicit calls to setCriteria()/setValues() to avoid this.