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- If operation fails (due to crash):
- USxS transaction can be partial posted
- Files left in inconsistent state (out of balance)
- Example: Post Purchase Order steps:
- Write PO header record
- Loop for each PO Item:
- Write item record
- Update encumbrances on budget
- Update encumbrances on appropriation
- Update encumbrances on cash
- If any of the steps fail, files can be out of balance
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