Policy example bank: common journal entries and scenarios

Create an example bank for the policy area: {policy_area}.

Inputs:
- Common scenarios: {scenarios}
- Accounts used: {accounts}
- System constraints: {system_constraints}
- Approval thresholds: {approval_thresholds}

Output:
1) For each scenario: description, accounting conclusion, journal entry, required support, review points.
2) Common mistakes and how to avoid them.
3) Quick-reference checklist at the end.

Keep examples realistic and implementable.