Ability to have project billing invoice numbering unique across the contracts

Summary:

Ability to have project billing invoice numbering unique across the contracts instead of having by contract

Content (please ensure you mask any confidential information):

Hi Team ,

As per our business requirement, we need an ability to have Project billing Invoice numbering unique across the contract ,instead of having by Contract.

Ex : For Contract A ,Numbering of invoice should be 001, 002, 003………….

For Contract B , Numbering of the Invoice should be 004, 005, 006………………

As per standard process, invoice numbering is unique for every contract, instead we want same unique sequence applied across contracts

Please help us ,if we can customize the Invoice Numbers based on Contracts.