What is the use and implication of the default budget account available under TAD

Summary:

When we enable budgetary control for project module, we have to do one mandatory set up related to default budget account under Project Transaction Account definition.

Can you please let me know the usage and implications of that account? Why it is mandatory?

Regards

Esha

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):