Transform item recepit from PO

I want to transform 2 items in PO to one item receipt.

my problem is that when I save the receipt record I am getting an error of

“The record has been deleted since you retrieved it”

looks like its happened when I save the item receipt.

my code:

function Run(irList) {
    try {
        

        var poName = irList[Object.keys(irList)[0]]["po"]; 

        var poId = getPO(poName)

        var irRec = context.record.transform({
            fromType: 'purchaseorder',
            fromId: poId,
            toType: 'itemreceipt'
        })

        var count = irRec.getLineCount('item')

        for (; i < irList.length; i++) {
            var irData = irList[i];


            createIR(irData, irRec, count, poId)

            var irId = irRec.save({
                ignoreMandatoryFields: true
            });

    } catch (e) {
        log.error('Run ' + i, e)
        errorsList.push({
            action: 'Run ' + i,
            m: e.message
        })
    }

function createIR(irData, irRec, count, poId) {

//irData = one item object
//irRec = item receipt object (after transform from po)
//count = the number of items in po
//poId = PO id

    try {

        var sublistId = 'item'

        for (var i = 0; i < count; i++) {
            irRec.setSublistValue(sublistId, 'quantity', i, '')
        }

        var itemId = getItemId(irData.item)

        var quantity = irData.quantity


        for (var i = 0; i < count && quantity; i++) {

            var item = irRec.getSublistValue(sublistId, 'item', i)

            if (item == itemId) {

                var qtyRem = irRec.getSublistValue(sublistId,
                    'quantityremaining', i)

                var diff = qtyRem - quantity

                if (diff >= 0) {
                    irRec.setSublistValue(sublistId, 'quantity', i, quantity)
                    break;
                } else {
                    quantity -= qtyRem
                    irRec.setSublistValue(sublistId, 'quantity', i, qtyRem)
                }
            }
        }

        var irId = irRec.save({
            ignoreMandatoryFields: true
        });