Negative Inventory Perpetual System Warning Checker
Trace signed perpetual inventory movements and negative balances; warnings not automatically errors or evidence of theft.
Description
Negative Inventory Perpetual System Warning Checker: return running units, negative balance movement indices.
A perpetual inventory ledger applies movements in sequence to an opening balance. A negative intermediate balance can occur even if the final total is positive.
This tool returns running units, negative balance movement indices. Use the stated units and model convention when interpreting these fields.
When to use this tool
Use this tool when the supplied inputs match the specific operation described above and you need a repeatable result under its stated convention.
- Check the supported input and output contract against an existing calculation or observation.
- Use the complete example to confirm units, selector spelling and result interpretation.
How to use the tool and how it works
- Enter every field in the input table using the stated units and the exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
Starting from nonnegative openingUnits, accumulate every signed movement. Return all running balances and the zero-based movement indices producing a negative balance.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| openingUnits | Opening units. | Finite number; zero or greater |
| movementUnits | Movement units. | List of finite numbers |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.runningUnits | Running units list, in the ordering described in the calculation. |
| result.negativeBalanceMovementIndices | Negative balance movement indices list, in the ordering described in the calculation. |
{
"input": {
"openingUnits": 5,
"movementUnits": [
-6,
2
]
},
"output": {
"result": {
"runningUnits": [
-1,
1
],
"negativeBalanceMovementIndices": [
0
]
}
}
}Limitations and assumptions
- The tool flags arithmetic balances without identifying timing errors, missing receipts or the cause of a discrepancy.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Check the underlying observations, units and conventions independently before using the result in a larger workflow. The tools listed below address nearby tasks; compare their inputs and scope before substituting one for this operation.
References
Similar or alternative tools
- fifo ending inventory and cogs
FIFO issue costing consumes oldest receipts first and preserves later-layer inventory.
- inventory turnover cogs average inventory
Calculate inventory turnover as cost of goods sold divided by average inventory, measuring how often inventory is sold and replaced per period.