Ability to add custom attributes to parties

Currently using the Parties module is limited due to the low number of pre-defined fields and no option to create/ add custom ones.

A great point about CLM is the level of customizability, but this module is completely against that as it does not provide any option to expand parties to a usable level.

In our case: The limitation of party attributes stops us from properly moving supplier data into CLM, it also prevents us from abandoning the currently used solution for contract generation, as we cannot rely solely on CLM.