Setting Program Cost via API does not update Cost

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Setting Program Cost via API does not update Cost

we are trying to update the Cost following this API definition:

http://developers.marketo.com/rest-api/endpoint-reference/asset-endpoint-reference/#!/Programs/updat...

But the results come back unchanged. We submitted cost json object as follows:

{
"costs": [
{
"cost": 952,
"note": "test",
"startDate": "2019-01-01"
}
],
"costsDestructiveUpdate": true
}

but the results that came back showed no update.

Any help understanding what we should do differently?

http://developers.marketo.com/rest-api/endpoint-reference/asset-endpoint-reference/#!/Programs/updat...