Issue: Invoices made through POS are automatically marked paid


Why does this happen?
- Invoices made against the Cash Sale party are always marked as fully paid.

- Invoices made in the POS mode are made against the Cash Sale party by default, but the user can change the party while creating the invoice
- User can toggle the "Fully paid" setting in POS which marks all the POS invoices made against all the parties as paid when enabled

Android/iOS/WEB/DESKTOP: 

- Check whether the POS invoices are made against Cash Sale party
- Check whether the Fully Paid toggle is enabled

Make the user aware of how the feature works


Reference link: https://flobiz.slack.com/archives/CMT5GLXEC/p1741692771118079?thread_ts=1740643307.731189&cid=CMT5GLXEC