Message type: E = Error
Message class:  CNV10310 - Message class for development class CNV_10310 
Message number: 556
Message text: &1: Total length = &2 exceeds field length = &3
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 CNV10310556 typically indicates that there is a data length issue during a data migration or conversion process. This error occurs when the total length of the data being processed exceeds the defined field length in the target structure. Here’s a breakdown of the cause, potential solutions, and related information:
Cause: Data Length Exceedance: The data being imported or converted has a total length that exceeds the maximum length defined for the corresponding field in the target database or structure. Data Mapping Issues: There may be discrepancies in the mapping of source data to target fields, leading to oversized data being placed into a field with a smaller defined length. Incorrect Data Types: The data type of the source field may not match the target field, causing issues with length validation.
Solution: Review Data Lengths: Check the source data to identify the length of the data being processed. Compare it with the target
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV10310555 Missing information in data record in control table: &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10310554 Object exists already
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10310557 &1: Overlap of structure fields for &2 and &3!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV10310580 Read data from &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.