Is it possible to override a line value when using the record.transform? I'm creating an item receipt record from a PO. However, I'd like to provide the quantity value for the line.

it returns a record that you can use to make changes

So once the Item Receipt record is created, I'd need to make changes then save the record?

same as record.load

record.transform does not persist the record initially so you can do something like myFancyNewRecord = record.transform..... and then you can do myFancyNewRecord.setValue('fieldId','value');

I tried this, but it gives me the following error: "*You cannot initialize itemreceipt: invalid reference 665152*" - 665152 is the poId.

const itemReceipt = record.transform({
                   fromType: record.Type.PURCHASE_ORDER,
                   fromId: poId,
                   toType: record.Type.ITEM_RECEIPT,
                   isDynamic: true,
               });
               const lineCount = itemReceipt.getLineCount({sublistId: 'item'});
               for (let line = 0; line < lineCount; line++) {
                   itemReceipt.setSublistValue({
                       sublistId: 'item',
                       fieldId: 'quantity',
                       line: line,
                       value: 5
                   });
               }
               const itemReceiptId = itemReceipt.save();