OrderLineItem ommited gross_sales_money filed in response

For some reason there is no gross_sales_money field in order’s line_items. Order is COMPLETED.
Can someone explain it?

Part of response:
{
“id”: “R3x8ACCTrtObf4iTDCUCHeAfV”,
“location_id”: “KJ97SJPGXPH9C”,
“line_items”: [
{
“uid”: “33bbbe52-69ee-4c12-9a9c-8a5b58040ff6”,
“quantity”: “1”,
“base_price_money”: {
“amount”: 11831,
“currency”: “USD”
},
“total_tax_money”: {
“amount”: 0,
“currency”: “USD”
},
“total_discount_money”: {
“amount”: 0,
“currency”: “USD”
},
“total_money”: {
“amount”: 11831,
“currency”: “USD”
},
“variation_total_price_money”: {
“amount”: 11831,
“currency”: “USD”
}
}
],
“created_at”: “2020-07-11T00:52:19.000Z”,
“updated_at”: “2020-07-11T00:59:57.000Z”,
“state”: “COMPLETED”
}

Orders created via the Orders API will always have gross_sales_money, but if it was an order generated from the POS application (which it looks like this one is), then it’s not guaranteed to be returned unfortunately. Since you have no taxes or modifiers, you can easily figure out that the gross_sales_money is 11831 for this particular item.