Billing as per accounting requirment

Summary:

Please let me know if the below requirement is possible in 23A.

For customer A, there will be a billing based on a milestone based, for example, 50000INR is the billed amount, and

Based on accounting standards, Requirement is to have Billing on percentage completion, for example, 55000 INR is the billed amount based on accounting requirement. A difference of 5000 should reflect as unbilled revenue.

Is this requirement possible? if not, any workaround is available?

Content (required):

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

23A

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