Is there a way to automate the tax code assignation on non PO documents lik

I'm looking for a way to automate the tax code assignation on purchases, I'm aware of the condition techniques for POs, but I would like to understand if it can be also applied to the other document in purchases so we can have a totally automate process on tax code assignation.

Documents like: Contracts, Info records, RFQ, Scheduling agreements, Outline Agremments