Message type: E = Error
Message class:  CNV_NCE_BAS - Number conversion engine: messages 
Message number: 106
Message text: Number range number is empty
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message CNV_NCE_BAS106 indicating that "Number range number is empty" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error suggests that a required number range object is not properly defined or is missing.
Cause: Missing Number Range Object: The number range object that is supposed to be used for generating unique identifiers is not defined in the system. Incorrect Configuration: The configuration for the number range might be incomplete or incorrectly set up. Data Migration Settings: During the data migration process, the settings for number ranges may not have been properly specified, leading to an empty value being referenced.
Solution: Check Number Range Configuration: Go to transaction SNRO (Number Range Objects) and check if the relevant number range object is defined. Ensure that the number range intervals are correctly set up and that they are active. Define Number Range: If the number range object
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_NCE_BAS105 Object &1: database analysis results not found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_NCE_BAS104 NR interval &1: interval for year &2 extracted
What causes this issue?  The program has extracted a new interval from the existing one.System Response  The program generates number range interval m...
CNV_NCE_BAS107 No detailed information available
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_NCE_BAS108 NR mapping values for &1 and &2 result in duplicates (number &3)
What causes this issue?  Source numbers that belong to the different NR intervals are mapped to the same target numbers. These mappings are not accept...
Click on this link to search all SAP messages.