Message type: E = Error
Message class:  CNV_10020 - Message class for package 10020 
Message number: 137
Message text: There are no DTLFLD records for the specified parameters
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_10020137 indicates that there are no DTLFLD (Detail Field) records for the specified parameters in the context of a data migration or conversion process, typically associated with the SAP S/4HANA migration or other data transfer activities.
Cause: This error usually occurs due to one of the following reasons: Missing Configuration: The required configuration for the data migration is not set up correctly, leading to the absence of DTLFLD records. Incorrect Parameters: The parameters specified in the migration process do not match any existing records in the DTLFLD table. Data Model Changes: If there have been changes in the data model or if the migration objects have been modified, it may lead to missing records. Inconsistent Data: The source data may not have the necessary fields or records that are expected during the migration.
Solution: To resolve this error, you can take the following steps: Check Configuration: Ensure that the configuration for the data migration is complete
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10020136 For package &1, specifying a sample target determ. object is not allowed
What causes this issue?  DTFLD records you maintain for package 10020 are package-independent and must consequently contain a sample target determinat...
CNV_10020135 For package &1, a sample target determination object must be specified
What causes this issue?  DTFLD records you maintain for package 10020 are package-independent and must consequently contain a sample target determinat...
CNV_10020138 Internal error: Initialization of internal table &1 failed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10020139 If you specify a target det. object, the source package number is ignored
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.