I attempted to set an Alt. Payment Terms and the less than amount at a very large amount but that did not prevent the term from being selected during order entry either.  I'll bring it up with our consultants and see if they have any suggestions.

Then the only alternative is to add a custom Control action defined on the datatype. In doing so, it will apply everywhere the datatype is used, and you can restrict the use of certain Payment methods within the code.

Then the only alternative is to add a custom Control action defined on the datatype. In doing so, it will apply everywhere the datatype is used, and you can restrict the use of certain Payment methods within the code.