Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 048
Message text: Company code &1 must be indicated; see long text
A chart of accounts is always assigned at the level of a controlling
area (rather than a company code), which means that all company codes
that belong to a controlling area have to use the chart of accounts that
is assigned to this controlling area.
Company code &V1& belongs to controlling area &V2&. Because chart of
accounts &V3& participates in the conversion, and because this chart of
accounts is assigned to the controlling area &V2&, all company codes
that belong to controlling area &V2& <ZH>must</> participate. This  also
applies to the company code &V1&.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Include company code &V1& in the list of participating company codes.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20100048 indicates that a company code must be specified in the context of a particular operation or transaction. This error typically arises during data migration or conversion processes, especially when using SAP's data migration tools or during the execution of specific programs that require a company code to be defined.
Cause: Missing Company Code: The most common cause of this error is that the company code field is either empty or not properly filled in the relevant transaction or program. Incorrect Configuration: There may be an issue with the configuration settings in the system that prevents the company code from being recognized. Data Migration Issues: If you are using a migration tool, the mapping of data may not include the company code, leading to this error.
Solution: Check Input Fields: Ensure that the company code is specified in the relevant input fields of the transaction or program you are executing. This may
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100047 Select at least one company code (or cancel)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100046 You did not confirm all activities!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100049 Set the 'Copy Rows' indicator for chart of accounts &1; see long text
What causes this issue?  If you do not indicate at least one company code which uses a chart of account that you want to convert, the <ZK>Copy R...
CNV_20100050 Company code &1, which also uses chart of accounts &2, was not indicated
What causes this issue?  Note: If you do not indicate at least one company code which uses a chart of account that you want to convert, the conversion...
Click on this link to search all SAP messages.