Sequential numbers in non-buffered number range object

I need some help pointing in the right direction to analyze and prevent a problem with a NON-BUFFERED custom number range object.
This process works well. Once or twice however, sequences have been created with an apparent delay and are out of order. I don't know why, or where to look to diagnose the timing, etc. It's very difficult to recreate.
We have a custom number range object; ZFSEQ in SNRO that is responsible for assigning a sequential number to a series of flat files produced by number of different interfaces. Those interfaces all use the FM 'NUMBER_GET_NEXT' and then they build a file name with that sequence number. That object is not buffered.
During heavy volume of updates (where lots of these sequences are being called and created by different interfaces, the table NRIV is locked and released by each interface. During this time of heavy updates, we have an infrequent problem that has occurred where a standard sales order create created a sequence number that is greater than the sequence number generated by the delivery create. (The delivery was created a couple of minutes later than the order, yet the order created a flat file sequence number greater than that of the delivery.
I hypothesize that the flat file call for the order (using the FM 'NUMBER_GET_NEXT') was somehow delayed(because of heavy lock/usage of NRIV). The actual order document and delivery document were created normally. I also am thinking that buffering on the object would prevent this. I cannot at this time implement buffering on the object, but we are working towards that.
The order create originates from our e-commerce system through a webserive, and in SAP, flows like this:
Main webservice RFC:     Z_ORDER_CREATE
          Call Z_create_order_bgd IN BACKGROUND TASK
                                  Call BAPI_SALESORDER_CREATEFROMDAT2 )
                                   MV45AFZZ--> userexit_save_document.
                                        call Z_FUNCTION_TO_GET_SEQUENCE
                                                  CALL FM 'NUMBER_GET_NEXT'    <---- order create sequential file created
          commit work.
The delivery sequential file is created in
     MV50AFZ1 (the Delivery User Exit)
Where can I look to conclusively see what happened to delay our sales order sequence? What could be done to prevent it?
Thanks
Jeremy H.

Just want to post the answer that we found to this issue and close it, though more comments are always welcome!
We are going to move forward with buffering the Z object for the range as studies have shown and all other consulting input seems to be that buffering will solve this problem.

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Number Range object skipping numbers SAP

Hi All,
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Are multiple users creating Purchase Orders at the same time?
If yes then this is possible. Because Number Range (unique Number) is assigned to Purchase Order at the start of the Transaction (ME21N).
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Hi,
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[Number Range Example:|http://wiki.sdn.sap.com/wiki/pages/viewpage.action?pageId=50004015]
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Hai Shalaka,
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#####>>> whenever master data loading is done system creates SIDs, &
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number & generate the next no in the series, so to check this latest
no for every time ( every record) system needs to go back to database
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>>>####
Please refer - SAPnote 130253
Loading Transcation data - The number range buffer for the dimension
ID's resides on the application server and reduces DB server accesses.
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500, the system will keep 500 sequential numbers in memory and need
not access the database
If you load a significant volume of transaction data (e.g., initial
load), increase the number range buffer. If possible, reset it to its
original state after the load in order to minimize unnecessary memory
allocation
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Asign points if helpfull
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Hi
Please tell document number range object . T-code :FBN1
PLEASE URGENT
Thanks
Krishna

Hello
A number range must be assigned to each document type in the SAP System. Via the document types, you distinguish the postings according to the different business transactions, for example customer payment, vendor credit memo, and so on. To store documents separately according to document types, you must assign a separate number range to each document type, for example to invoices or to credit memos.
In the following activities:
You define your document number ranges.
You can determine which intervals of document number ranges are to be copied from one company code into another.
You can determine which intervals of document number ranges are to be copied from one fiscal year into another.
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In this IMG activity you create number ranges for documents. For each number range you specify (among other things):
a number interval from which document numbers are selected
the type of number assignment (internal or external)
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You can use one number range for several document types. This means you can differentiate documents by document type but combine them again for filing the original documents, provided you store your original documents under the EDP document number.
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You should use internal number assignment if the original documents do not have a unique document number. This is the case, for example, with vendor invoices.
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The number intervals must not overlap. If you use year-dependent number ranges, you can specify the same interval with the same key several times for different to- fiscal years (the limit up to which a number range is still valid). If you want to define number ranges which are independent of the to-fiscal year, enter 9999 in the to- fiscal year field.
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Intervals which are copied
To fiscal year(s) (validity limit up until which the number range is valid)
Company code from which you copy (source company code)
Company code(s) into which you copy (target company code(s))
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Company code(s) within which you copy
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Fiscal year from which you copy (source fiscal year)
Fiscal year into which you copy (target fiscal year)
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Make all necessary specifications for copying the fiscal years.
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*assign points if useful

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Hi Experts,
i wanted to create a number range object thru SNRO.
The creation was successful in DEV system.
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Thanks a lot for all your valuable inputs.
But i am still not out of this so called misconception - Are number range objects to be transported to QA or to be created afresh in QA/PRD?
Earlier some one told to be created but now i see they can be transported.
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try attribute change run first if dont work try this
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save and click yes to continue
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Hi
I am having problem regarding ODS actvatn, My oDS is gttng fail due to number range for char object doesn't exist.
error when checking sid for ODS.
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points will be assigned
kindly mail me 2 [email protected]

Hi,
chk tis blog.. hope it clears wat buffering is
/people/vikash.agrawal/blog/2006/04/05/load-lots-of-data-147faster148-with-buffering-number-range
What is buffering number range:
Buffer the Numbers ( which system picks up from database -in case of Master Data SIDs & in case of Transaction Data Dimension Ids) and use these buffered numbers rather than hitting the database (for each new master data records or for each new combination of SIDs to create a new Dimension Ids). So the concept is
SID Number Range can be Buffered Instead of Accessing the Database for Each SID
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About Number range object

Hi All,
what is Number range object and what is the purpose of this.?
thanks in advance ...

Hi,
1) Goto Tcode SNRO
2) select ur concerned OBJECT there.
3) Click on Number Ranges Push Button.
4) then click on Display Interval Button over there.
Document:
A number range must be assigned to each document type in the SAP System. Via the document types, you distinguish the postings according to the different business transactions, for example customer payment, vendor credit memo, and so on. To store documents separately according to document types, you must assign a separate number range to each document type, for example to invoices or to credit memos.
In the following activities:
You define your document number ranges.
You can determine which intervals of document number ranges are to be copied from one company code into another.
You can determine which intervals of document number ranges are to be copied from one fiscal year into another.
Define Document Number Ranges
In this IMG activity you create number ranges for documents. For each number range you specify (among other things):
a number interval from which document numbers are selected
the type of number assignment (internal or external)
You assign one or more document types to each number range. The number range becomes effective via the document type specified in document entry and posting.
You can use one number range for several document types. This means you can differentiate documents by document type but combine them again for filing the original documents, provided you store your original documents under the EDP document number.
Note
The type of number assignment is of special importance. For each document type you should check whether a separate number range must be used and which type of number assignment is most appropriate.
One example of a case where external number assignment would be suitable is when you transfer documents into your SAP system from a non-SAP system. The numbers must be unique. The number range is not displayed with external numbers. You must therefore ensure that you do not skip any numbers when entering numbers manually (for organizational reasons).
You should use internal number assignment if the original documents do not have a unique document number. This is the case, for example, with vendor invoices.
Number ranges for documents are company code-dependent. You must therefore create your number ranges for each company code in which the document type is used, namely with the same number range key.
The number intervals must not overlap. If you use year-dependent number ranges, you can specify the same interval with the same key several times for different to- fiscal years (the limit up to which a number range is still valid). If you want to define number ranges which are independent of the to-fiscal year, enter 9999 in the to- fiscal year field.
Caution
For sample documents, use a number range with key X2, for recurring entry documents with key X1. These keys may not be used for other number ranges.
Recommendation
Store your original documents (paper documents) under the EDP number of the SAP System. You should write the EDP document number on the original document. In this way, the original document for a business transaction can be found at any time.
Activities
1. Determine how document filing is to be carried out in your company codes.
2. Define your number ranges accordingly.
3. Make sure that the number ranges are assigned to the corresponding document types.
Copy to Company Code
In this activity, you can copy intervals of document number ranges from one company code to other company codes. To do this, you have to store the following information:
Intervals which are copied
To fiscal year(s) (validity limit up until which the number range is valid)
Company code from which you copy (source company code)
Company code(s) into which you copy (target company code(s))
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Make all necessary specifications for copying the number ranges.
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In this activity, you can determine which intervals of document number ranges are to be copied from one fiscal year into another per company code. To do this, you have to define the following information:
Company code(s) within which you copy
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Fiscal year from which you copy (source fiscal year)
Fiscal year into which you copy (target fiscal year)
Activities
Make all necessary specifications for copying the fiscal years.
Note
The number ranges are only copied per company code into the target fiscal year if no intervals exist there for this fiscal year.
http://help.sap.com/saphelp_47x200/helpdata/en/2a/fa02e3493111d182b70000e829fbfe/frameset.htm
Regards,
Shiva Kumar

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Hi
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Thanks in advance,
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Hi Sowdha,
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Assign points if this helps.
thanks
sarma

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hello
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Sequential numbers in non-buffered number range object

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