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Rossum doesn't detect a certain line item

(edited)

Hi!
I've been trying out Rossum's free trial to extract invoice data from this sample invoice: https://pdfhost.io/v/Se73VSKw7_JohnDoe10132020pdf.pdf

Its table includes 4 columns that I'm interested in extracting: description, price, quantity, and amount.

The children of the association schema section is defined as,

{
	"rir_field_names": [
		"table_column_description"
	],
	"constraints": {
		"required": true
	},
	"default_value": null,
	"category": "datapoint",
	"id": "item_description",
	"label": "Description",
	"type": "string"
},
{
	"rir_field_names": [
		"table_column_amount_base"
	],
	"constraints": {
		"required": true
	},
	"default_value": null,
	"category": "datapoint",
	"id": "item_amount_base",
	"label": "Price",
	"type": "number",
	"format": "# ##0"
},
{
	"rir_field_names": [
		"table_column_quantity"
	],
	"constraints": {
		"required": true
	},
	"default_value": null,
	"category": "datapoint",
	"id": "item_quantity",
	"label": "Quantity",
	"type": "number",
	"format": "#,##0.#"
},
{
	"rir_field_names": [
		"table_column_amount_total"
	],
	"constraints": {
		"required": true
	},
	"default_value": null,
	"category": "datapoint",
	"id": "item_amount_total",
	"label": "Amount",
	"type": "number",
	"format": "#,##0.#"
}

However, Rossum doesn't seem to detect the price column (table_column_amount_base),

https://i.imgur.com/CCU6fZM.png

I've tried several things including changing its numeric format and its label (e.g. to "Price ($)" as it appears in the document), with no success.

Any idea of what I'm doing wrong here?