RESTClient1 problema con palabra "notes"

[GustavoCruz]

Hola amigos del foro, tengo un problema al momento de enviar un json. y es que si en el cuerpo va la clave "notes" me genera error
si lo envío con otra herramienta no me muestra error.

{
	"number": 4,
	"prefix": "FE",
	"document_type_code": "01",
	"operation_type_code": "10",
	"resolution_number": 18764008153137,
	"currency_type_code": "COP",
	"date": "2020-12-07",
	"time": "11:58:05",
	"customer": {
		"address": "Sincelejo - Sucre",
		"identification_number": 806008394,
		"dv": 7,
		"organization_type_code": 2,
		"identification_type_code": 31,
		"merchant_registration": "No tiene",
		"municipality_code": "13001",
		"regime_type_code": "49",
		"language_code": "es",
		"country_code": "CO",
		"tax_code": 1,
		"phone": 6502525,
		"name": "MUTUAL SER E.P.S-S",
		"liability_type_code": "R-99-PN",
		"email": "facturacion_electronica@mutualser.com"
	},
	"notes": [{
		"text": "Paciente: RC 1100690156 - TABOADA CHIMA VICTOR ANDRES Atención No: 175002; Autorización No. 7067000126869; Contrato No. SICO"
	}],
	"payment_form": {
		"payment_form_code": "2",
		"payment_method_code": "ZZZ",
		"payment_due_date": "2021-02-05",
		"duration_measure": 60
	},
	"prepaid_payments": [{
		"identifier": "Copago",
		"paid_amount": 0
	}],
	"legal_monetary_totals": {
		"line_extension_amount": 8240,
		"tax_exclusive_amount": 0,
		"tax_inclusive_amount": 8240,
		"allowance_total_amount": 0,
		"charge_total_amount": 0,
		"payable_amount": 8240
	},
	"invoice_lines": [{
		"unit_measure_code": "94",
		"invoiced_quantity": 1,
		"line_extension_amount": 8240,
		"free_of_charge_indicator": false,
		"description": "CONSULTA DE CONTROL O DE SEGUIMIENTO POR NUTRICION Y DIETETICA +",
		"code": "890306",
		"item_identification_type_code": "999",
		"price_amount": 8240,
		"base_quantity": 1
	}]
}],
}

ese el el json completo que me genera error, pero si quito la parte de

"notes": [{
		"text": "Paciente: RC 1100690156 - TABOADA CHIMA VICTOR ANDRES Atención No: 175002; Autorización No. 7067000126869; Contrato No. SICO"
	}],

entonces pasa sin problemas.

todo esto ocurre utilizando los componentes de REST.

Gracias por su tiempo