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SAP Number Range Exhaustion Calculator for Custom Objects

When a number range runs out, document creation stops with an error and the fix is urgent and awkward. This calculator forecasts the years left in an interval, including growth and the numbers lost to buffering, so you can extend it on your schedule.

Your numbers

Lower limit of the interval as defined in transaction SNRO.

Upper limit of the interval.

The last number issued.

per day
8 %
numbers

Number of values fetched into main memory at once. Zero if the range is not buffered.

per year

Instance restarts and system restarts that can discard unused buffered numbers.

Your results

Numbers remaining
5,799,999
Years left with growth
4 years
Solves the sum of a growing yearly series for the remaining count.
Total capacity of the interval
9,000,000
Interval used
35.6%
Worst-case numbers lost to buffering per year
160
Upper bound, as each server can lose a full buffer on a restart.
Annual consumption now
1,277,660
Days left at today's volume
1,657 days

A planning forecast. Check the live status in SNRO and consider year-dependent or external intervals. Changing an interval on a live range has consequences, so involve Basis and the process owner.

Save results:

Years left by daily volume

Sweeps Numbers issued per day from 500 to 20000, holding your other inputs fixed.

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How to use it

Open transaction SNRO, display the number range object and look at the intervals and their current number levels. Enter the start, end and current number of the interval you care about. Add the daily volume from your document statistics and an expected growth rate. If the object is buffered in main memory, enter the buffer size, the number of application servers and how often instances restart. The result shows remaining numbers, the days left at today's rate and the years left with growth.

  • Check each interval and sub-object, not only the object
  • Use the average over a full year, not a quiet week
  • Set the buffer to zero for unbuffered ranges

The math

Capacity is end minus start plus one. Remaining numbers are end minus the current level. Yearly consumption is daily volume times 365, plus the worst-case numbers lost to buffering, which is servers times buffer size times restarts. With growth g, consumption in year n is the starting amount times (1+g) to the power n. The sum of those years equals the remaining numbers, which gives years left as ln(1 + remaining x g / yearly use) divided by ln(1+g). With zero growth the forecast reduces to remaining divided by yearly use.

  • Years = ln(1 + R x g / A) / ln(1 + g)
  • R is remaining numbers, A is yearly use, g is growth
  • Lost numbers are an upper bound, real loss is often smaller

Preventing the surprise

Extend intervals well before the limit, and for custom objects design the key length with growth in mind. Buffering improves throughput but creates gaps, which matter for processes that require gapless numbering, so those objects should not be buffered. Where law requires gapless numbers, as in many invoice numbering rules, use an unbuffered range and accept the throughput cost. Add a monitoring check, for example a report that reads the NRIV table and warns at 80 percent used, and review it as part of month-end.

  • Warn at 80 percent used, act at 90
  • Do not buffer ranges that must be gapless
  • Document who owns each custom number range object

Frequently Asked Questions

Why are there gaps in my numbers?

Buffered ranges hand each server a block of numbers. If the server restarts or the transaction rolls back, unused numbers in the buffer are discarded. This is normal and is the price of speed.

Can I extend an interval that is nearly full?

Often yes, by adding a new interval in SNRO and switching to it, but it depends on the object, the number format and the external interfaces that expect a given length. Plan and test the change.

Where is the current level stored?

In the table NRIV, which holds each interval with its current number level. SNRO displays it, and a small report can monitor it for you.

Is the forecast exact?

No. It assumes smooth growth and a worst-case loss from buffering. Use it to decide when to act, and re-run it quarterly with real consumption.

Netray can build a small monitor that reads your number ranges and other capacity limits and raises a warning long before users see an error.

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