/**
 * Hi All, I have encountered a custom record as a sublist issue:
 * I have create a custom record with a customer field (internal id is custrecord_gw_csrc_cust),
 * I checked "record is parent" in the customer field setting and I have successfully
 * showing the custom record in CUSTOMER record.
 * However, when I run the following code in debugger, I failed to get line count of the sublist from customer record.
 *
 * I tried with contact sublist and it's success
 * Then I create a saved search that search for the custom record,
 * and then create a custom sublist that uses the saved search I just created.
 * The sublist is showing in customer record as well but I still can't get line count.
 *
 * Did I miss anything in settings, did I do anything incorrectly or (I am suspecting) is this a bug?
 */
require(['N/record'], function(record){
  var customer = record.load({
    type: record.Type.CUSTOMER,
    id: 7083,
    isDynamic: true
  })
  // It's a custom record as a sublist in customer (custom record name is "Customer Sales Return Configurations")
  var customRecordAsSublistCount = customer.getLineCount({sublistId:'recmachcustrecord_gw_csrc_cust'}) // Count is 0 (should be 2)

  // Tried with contact sublist, it's working
  var contactCount = customer.getLineCount({sublistId:'contactrole'}) // Count is 1 (correct!!)

  // It's a custom sublist source from a saved search of "Customer Sales Return Configuration"
  var customSublistCount = customer.getLineCount({sublistId:'customsublist69'}) // Count is 0 (should be 2)

  //var sublist = customer.getSublist({sublistId:'recmachcustrecord_gw_csrc_cust'}) // This will throw an unexpected exception
  var sublists = customer.getSublists();
  log.debug({title:'test', details:'end'})
})

Allow Child Record Editing