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I need to generate the Sales Order Item Fulfillment in NetSuite using a Restlet 2.0 script setting Serial Numbers for each required item.

My script is:

/**
 * @NApiVersion 2.x
 * @NScriptType Restlet
 */
define(['N/record', 'N/search'], function(record) {
    function createItemFulfillmentFromSalesOrder(wcOrderId, serialNumbers) {
        try {
            var salesOrder = record.load({
                type: record.Type.SALES_ORDER,
                id: wcOrderId,
                isDynamic: true
            });
            var itemFulfillment = record.transform({
                fromType: record.Type.SALES_ORDER,
                fromId: wcOrderId,
                toType: record.Type.ITEM_FULFILLMENT,
                isDynamic: true
            });
            var itemCount = itemFulfillment.getLineCount({ sublistId: 'item' });

            for (var i = 0; i < itemCount; i++) {
                var inventoryDetail = record.create({
                    type: record.Type.INVENTORY_DETAIL,
                    isDynamic: true
                });
                inventoryDetail.setValue({
                    fieldId: 'item',
                    value: salesOrder.getSublistValue({
                        sublistId: 'item',
                        fieldId: 'item',
                        line: i
                    })
                });
                inventoryDetail.selectNewLine({sublistId: 'inventoryassignment'});
                inventoryDetail.setCurrentSublistValue({
                    sublistId: 'inventoryassignment',
                    fieldId: 'quantity',
                    value: 1
                });
                inventoryDetail.setCurrentSublistValue({
                    sublistId: 'inventoryassignment',
                    fieldId: 'issueinventorynumber',
                    value: serialNumbers[i]
                });
                inventoryDetail.commitLine({ sublistId: 'inventoryassignment' });
                inventoryDetailId = inventoryDetail.save();

                itemFulfillment.selectLine({ line: i });
                itemFulfillment.setCurrentSublistValue({
                    sublistId: 'item',
                    fieldId: 'inventorydetail',
                    value: inventoryDetail
                });
                itemFulfillment.commitLine({ sublistId: 'item' });
            }

            var fulfillmentId = itemFulfillment.save();
            return {
                success: true,
                fulfillmentId: fulfillmentId
            };
        } catch (error) {
            return error;
        }
    }

    return {
        get: function(params) {
            var wcOrderId = params.wcOrderId;
            var serialNumbers = params.serialNumbers;
            if (wcOrderId && serialNumbers) {
                serialNumbers = serialNumbers.split(',');
                return JSON.stringify(createItemFulfillmentFromSalesOrder(wcOrderId, serialNumbers));
            } else {
                return JSON.stringify({
                    success: false,
                    message: 'Missing parameters: wcOrderId and/or serialNumbers'
                });
            }
        }
    };
});

But I'm getting the error "You have entered an Invalid Field Value <serial number internal id> for the following field: issueinventorynumber".

The error isn't related to the Sales Order or the Serial Number. It should be an error in the creation of the Inventory Detail record or in setting the issueinventorynumber.