Which two configurations are required to force users to enter a value in the Class field for transactions?

The requirement to ensure users enter a value in the Class field for transactions is met by enabling the accounting preference that makes classes mandatory. When this feature is enabled in the system settings, it sets a clear requirement for every transaction to have a specified class, thus promoting consistency in categorizing transactions and improving reporting and analysis down the line.

Setting a default value based on the Class of the current user might assist with user experience by pre-filling the Class field, but it does not enforce entry of a value. Additionally, creating a dummy value such as "No Class" would ultimately misrepresent the integrity of the data and does not fulfill the requirement of ensuring transactions are categorically classified with meaningful data. Disabling the accounting preference effectively allows transactions to be saved without necessarily having a value in the Class field, which contradicts the goal of enforcing this entry. Hence, enabling the accounting preference to make classes mandatory is the essential step for enforcing this requirement.