What does this error mean?

[muffinrecon]

I am getting this response when placing a limit order with your Orderbook API:

{
  statusCode: 400,
  message: 'bit invalidator only supported for RFQ orders',
  error: 'Bad Request'
}

What does this mean? I can't find any reference for bit invalidator (outside of the contract).

[muffinrecon]

If anyone is struggling with this, their documentation is outdated. For examples, please read the unit tests in the current codebase.