Currently you can either have a custom model or the standard Microsoft maintained model.

In terms of general understanding for the invoice the standard MS one works well enough but for some suppliers there is additional complexity which the standard model will not handle.

We should not have to run a highly complex custom model to try to cater for all vendor scenarios and standard scenarios.

By adding the ability to identify a custom model at a vendor we would be able to collect the additional or complex information as needed for that supplier. This would mean that we would need to run the standard model first to collect the data it can to understand the vendor in order to run the additional custom model. That is understood and accepted.

If there is no custom model defined then just keep going with the standard process.