Regarding Number Generation

Hi Experts,
I am SAP MDM Consultant and have recently come across this issue pertaining to number generation,need your expert guidance to solve it.
Problem Definition : In our landscape Number generation takes places through a BAPI function call to ECC system,This data is then filled in the form and then on submission data gets saved in MDM.Later the same gets syndicated to ECC after enrichment and approvals.Recently in dev system we have encountered Duplicate Vendor number in MDM system.MDM is not generating number,its the BAPI call from ECC which does this.I think some previously used numbers must have be released for use and the same has been used by BAPI.
So,can you please guide what can be reasons of inconsistent number generations and which methods are used to release the same unused numbers for use?
Quick help will be appreciated.
Thanks,
Ravi

.I think some previously used numbers must have be released for use and the same has been used by BAPI.
SAP has no process to release old numbers,
There is a function module to get the next number: 'NUMBER_GET_NEXT'
It just uses the the number range number and the number range object and reads then the next number from the number range table NRIV.
Usually you cannot create duplicates, SAP ends in a dump.
So I guess your problem is created by either resetting the number range in ERP production system manually, or somebody transported the intervals from DEV to PROD system despite of the endless warnings, which obviously has then the lower current number as you usually have not as much materials in a DEV system like in a PROD system.
It can already be years ago that a number range was resetted, and you are just approaching numbers that are already used.
You have to analyze the numbers in MARA table and compare it with the number range intervals and their current number.

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[Ref 1] B. McCullough, B. Wilson. On the Accuracy of Statistical Procedures in Microsoft Excel 97.
Computational Statistics & Data Analysis. Vol. 31 No. 1, pp 27-37. July 1999.
http://users.df.uba.ar/cobelli/LaboratoriosBasicos/excel97.pdf
[Ref 2]L. Knüsel. On the accuracy of the statistical distributions in Microsoft Excel 97. Computational Statistics & Data Analysis. Vol. 26 No. 3, pp 375-377. January 1998.
http://www.sciencedirect.com/science/article/pii/S0167947397817562
[Ref 3]B. McCullough, B. Wilson. On the Accuracy of Statistical Procedures in Microsoft Excel 2000 and Excel XP.
Computational Statistics & Data Analysis. Vol.40 No. 4, pp 713-721. October 2002.
https://www.researchgate.net/publication/222672996_On_the_accuracy_of_statistical_procedures_in_Microsoft_Excel_2000_and_Excel_XP/links/00b4951c314aac4702000000.pdf
[Ref 4] B. McCullough, B. Wilson. On the Accuracy of Statistical Procedures in Microsoft Excel 2003.
Computational Statistics & Data Analysis. Vol.49. No. 4, pp 1244-1252. June 2005.
http://www.pucrs.br/famat/viali/tic_literatura/artigos/planilhas/msexcel.pdf
[Ref 5] L. Knüsel. On the accuracy of statistical distributions in Microsoft Excel 2003. Computational Statistics & Data Analysis, Vol. 48, No. 3, pp 445-449. March 2005.
http://www.sciencedirect.com/science/article/pii/S0167947304000337
[Ref 6]B. McCullough, D.Heiser. On the Accuracy of Statistical Procedures in Microsoft Excel 2007.
Computational Statistics & Data Analysis. Vol.52. No. 10, pp 4570-4578. June 2008.
http://users.df.uba.ar/mricci/F1ByG2013/excel2007.pdf
[Ref 7] A. Yalta. The Accuracy of Statistical Distributions in Microsoft<sup>®</sup> Excel 2007. Computational Statistics & Data Anlaysis. Vol. 52 No. 10, pp 4579 – 4586. June 2008.
http://www.sciencedirect.com/science/article/pii/S0167947308001618
[Ref 8] B. McCullough. Microsoft Excel’s ‘Not The Wichmann-Hill’ Random Number Generators. Computational Statistics and Data Analysis. Vol.52. No. 10, pp 4587-4593. June 2008.
http://www.sciencedirect.com/science/article/pii/S016794730800162X
[Ref 9] G. Melard. On the Accuracy of Statistical Procedures in Microsoft Excel 2010. Computational Statistics. Vol.29 No. 5, pp 1095-1128. October 2014.
http://homepages.ulb.ac.be/~gmelard/rech/gmelard_csda23.pdf
[Ref 10] L. Knüsel. On the Accuracy of Statistical Distributions in Microsoft Excel 2010. Department of Statistics - University of Munich, Germany.
http://www.csdassn.org/software_reports/excel2011.pdf

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https://support.microsoft.com/en-us/kb/828795
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