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Mutually Exclusive Arguments Error

Fix MUTUALLY_EXCLUSIVE_ARGUMENTS in SuiteScript setSublistValue calls by supplying required parameters like line index.

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{
  "type": "error.SuiteScriptError",
  "name": "MUTUALLY_EXCLUSIVE_ARGUMENTS",
  "message": "Can't use mutually exclusive arguments..."
}

setSublistValue was called without a required line parameter.

recordObject.setSublistValue({
  sublistId: "item",
  fieldId: "custcol_myfield",
  value: results[guid]
});

Provide the target line index (or line key path, depending on your implementation) when setting sublist values.

recordObject.setSublistValue({
  sublistId: "item",
  fieldId: "custcol_myfield",
  line: lineIndex,
  value: results[guid]
});