Edit Json Problem

[LXARGENTINA_S_A]

Hi!

We have a problem with the next expression:

{
"Action": "Edit",
"Properties": {
"Locale": "",
"Location": "",
"Timezone": ""
},
"Rows": [
<<Start: Select(dbo.Subconceptos_Presupuestarios_2020[ID];[ID_Concepto]=[_THISROW-1].[ID];TRUE)>>
{
"ID": "<<[ID]>>",
"Monto": "<<[_THISROW-1].[Monto_Nuevo]>>"
}
<<END>>
]
}

This should paste the data from the table conceptos_actualizacion into the table subconceptos_presupuestarios_2020 but it gives us the following error:

what could be happening?

@Phil @Steve 

[Steve]

Why are you using [_THISROW-1]?