I am creating a script in SS2.0 that will do autofulfillment and I have a problem with creating inventory assignment. Can anyone take a look and help me find what am I doing wrong ?

var fulfillmentRecord = record.transform({ fromType : typeOfRecord, fromId : currentRecordInternalId, toType : record.Type.ITEM_FULFILLMENT, isDynamic : true });
      var fulfillmentItemCount = fulfillmentRecord.getLineCount({ sublistId : 'item' });        
      for (var i = 0; i < fulfillmentItemCount; i++) // Loop through each item in the fulfillment record
      {
            fulfillmentRecord.selectLine({ sublistId : 'item', line : i });
            var isBinItem = fulfillmentRecord.getSublistValue({ sublistId : 'item', fieldId : 'binitem', line : i });
            
            if (isBinItem == 'T') {
                var arrSorted = getSortedAvailableBinsFromRecord(fulfillmentRecord.getSublistValue({ sublistId : 'item', fieldId : 'location', line : i }), fulfillmentRecord.getSublistValue({ sublistId : 'item', fieldId : 'itemlocationbinlist', line : i }));
                
                var fulfillmentInventoryDetail = fulfillmentRecord.getCurrentSublistSubrecord({ sublistId: 'item', fieldId: 'inventorydetail' });
               
                var qtyRemaining = parseFloat(fulfillmentInventoryDetail.getValue({ fieldId : 'quantity' }));
                
                var ifItemBinCount = arrSorted.length;
                for (var j = 0; j < ifItemBinCount; j++) // Loop through all of the bins for this item
                {
                    var binNumber = arrSorted[j].binNumber; // Get the bin number's
                    var binAvailableQuantity = parseFloat(arrSorted[j].quantity); 
                    if (binAvailableQuantity <= qtyRemaining) { 

                        fulfillmentInventoryDetail.selectNewLine({ sublistId : 'inventoryassignment' });
                        fulfillmentInventoryDetail.setCurrentSublistText({ sublistId : 'inventoryassignment', fieldId : 'binnumber', text : binNumber, ignoreFieldChange : true });
                        fulfillmentInventoryDetail.setCurrentSublistValue({ sublistId : 'inventoryassignment', fieldId : 'quantity', value : binAvailableQuantity, ignoreFieldChange : true });
                        fulfillmentInventoryDetail.commitLine({ sublistId : 'inventoryassignment' });
                        
                        qtyRemaining = qtyRemaining - binAvailableQuantity;
                        if (qtyRemaining === 0) {
                            break;
                        }
                    }
                    else { 
                        fulfillmentInventoryDetail.selectNewLine({ sublistId : 'inventoryassignment' });
                        fulfillmentInventoryDetail.setCurrentSublistText({ sublistId : 'inventoryassignment', fieldId : 'binnumber', text : binNumber, ignoreFieldChange : true });
                        fulfillmentInventoryDetail.setCurrentSublistValue({ sublistId : 'inventoryassignment', fieldId : 'quantity', value : qtyRemaining, ignoreFieldChange : true });
                        fulfillmentInventoryDetail.commitLine({ sublistId : 'inventoryassignment' });
                        
                        qtyRemaining = 0;
                        break;
                    }
                }
            }
          fulfillmentRecord.commitLine({ sublistId : 'item' });
        } //for
        fulfillmentRecord.save();

With this code I am getting "PLEASE_CONFIGURE_THE_INVENTORY_DETAIL_FOR_1" I have only one item on that order that I am trying to fulfill, items are available. I think that I must be missing some subrecord submission but I can't find it ;(