Allow Users to Save Sales Without Payment

[thida-bcn]

Currently, the POS system supports "Allowed Partial Payment," but does not allow full credit sales.
POSAwesome supports credit transactions, and implementing a similar feature in the existing POS would enhance usability.

Feature Request:

Allow users to complete a sale without immediate payment (credit sales).
Enable users to settle payments later without being required to select a specific sales invoice.
Improve flexibility in credit transactions to align with user needs and industry practices.
This enhancement would streamline transactions and improve usability for businesses handling credit-based sales.