Separate billed work from received cash

First step

Fictional example: a desk-only job starts with $500 cash, is completed in January, and has a $1,000 invoice due February 15. Record the invoice date and amount separately from a $400 receipt on February 10, a $300 expense on February 12, and the $600 still unpaid on February 16. Track opening cash, each cash movement, closing cash, invoice balance, evidence placeholder, and next review date. Use no real customer, account, invoice, or payment data.

The fictional ledger shows $1,000 billed, $400 received, $600 unpaid, and $600 closing cash after the $300 expense; the invoice itself never increases cash.

An invoice date is used as proof that cash was already received on the same day.