Each document you create must have a unique, sequential, and identifiable number. For this purpose you assign number ranges to your different document types. Additionally you define number ranges for your customer/supplier/employee numbers and product numbers.
The numbers for your documents and records are assigned sequencially starting with the first number you define for your number range.
Administration > System > Basic settings > Settings tab > Number ranges subtab
Note
Always define your number ranges before you start to create data or documents.
First you have to decide whether you want to use existing number ranges or if you want to use new number ranges.
If you want to create a new number range, please discuss it with your tax advisor in advance.
When you define a number range, the following applies:
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Letters can be used (except for customers and suppliers), but there must be a consecutive number at the end (e.g. 10000).
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The number ranges must all be different and should not overlap (e.g. customers: 100000 and suppliers: 400000)
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The number of digits should not change (do not start at 1 but e.g. 100001)
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Supplier and customer numbers should have the same number of digits. In addition, these should be 5-digit, 6-digit or 7-digit without letters to prevent problems with the accounting export.
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Avoid special characters like spaces, periods, commas, colons, semicolons, and umlauts.
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If project-specific number ranges are used, they must not be identical
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Click edit for the document or record type you want to define, e.g. invoice number or customer number.
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Enter the new number yo want to start your number range with and click OK.
The number ranges should be chosen large enough for your needs.
Example of a proven number ranges:
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Offer number: 100000
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Order number: 200000
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Delivery note number: 300000
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Invoice number: 400000
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Credit note number: 900000
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Purchase order number: 100000
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Statement of work number: 300000
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Travel expenses number: 30000
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Production number: 40000
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Inquiry number: 50000
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Customer number: 10000
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Supplier number: 70000
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Employee number: 90000
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Item number: 1000000
Important
The numbers assigned to documents via the central number range must not be changed.
You can use variables in number ranges, e.g. {YEAR}-10000. This means that if the year is 2022, the first number of your number range will be 2022-10000.
Possible variables:
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{JAHR} → 4-digit display of the year
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{MONAT} → Display of the current month
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{TAG} → Display of the current day
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{KW} → Display of the current calendar week
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{ADDRESS_} → Document address contents: e.g. {ADDRESS_CUSTOMER NUMBER},{ADDRESS_BLANKFIELD1}, etc.
You can define project-specific number ranges on the following path:
Master data > Project > Open the project by clicking on 
> Settings tab > Own number ranges subtab
To use project-specific number ranges, select the Own number ranges check box.
Warning
If you select to use project-specific number ranges, we advise strongly to define unique number ranges for each type of document you will create. If you do not define a number range for a document type you use, the system will start to count up from 1 for every new data set. This can cause potential conflicts in various fields with the general number range if values are identical.
You can find more information on projects here.