action POST amend "Multi AmendRequest is not supported" error with single amendment

[sjan]

Attempting to send a single amendment via action POST amend and getting the error "Multi AmendRequest is not supported" 

The payload: (ids redacted)

{
	"requests":
	{
		"Amendments":
		[
			{
				"DestinationAccountId":"......acct_id_a",
				"DestinationInvoiceOwnerId":".....acct_id_b",
				"SubscriptionId":".....sub_id",
				"ContractEffectiveDate":"2020-02-05",
				"CustomerAcceptanceDate":"2020-02-05",
				"ServiceActivationDate":"2020-02-05",
				"Status":"Completed",
				"Type":"OwnerTransfer"
			}
		]
	}
}

The response is:

{
	"faultcode": "fns:INVALID_VALUE",
	"faultstring":"Multi AmendRequest is not supported.",
	"detail":
	{
		"UnexpectedErrorFault":
		{
			"FaultCode":"INVALID_VALUE",
			"FaultMessage":"Multi AmendRequest is not supported."
		}
	}
}

It seems that error should only occur if I put multiple subscription amendments in one call, but it's returning for this single call.

Any ideas? Work-arounds?

[sjan]

Until there's a fix for this (or better yet it gets rolled into the invoice REST endpoint) I've gone around the issue by using action update. It works fine that way.

[johnswann]

I found this post as I was having the same trouble.  I eventually discovered that you seem to get that error message if the JSON is wrong.

In my case, I had somehow managed to omit {"requests: ...} around everything.  In yours I would guess that the problem is that your requests is an objet, not an array, ie you have {"requests": {"Amendments"....}} instead of {"requests": {{"Amednment"...}]}.

It is a thoroughly confusing and unhelpful error.