Message type: E = Error
Message class:  /SCTM/EHS_DG -  
Message number: 028
Message text: Item data of trip &1 being mapped
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 /SCTM/EHS_DG028 Item data of trip &1 being mapped typically relates to issues in the SAP Transportation Management (TM) or Environment, Health, and Safety (EHS) modules, particularly when dealing with dangerous goods management. This error indicates that there is a problem with the mapping of item data for a specific trip.
Cause: Incomplete Data: The item data for the trip may be incomplete or missing required fields, which prevents proper mapping.
Configuration Issues: There may be configuration issues in the dangerous goods management settings or in the transportation management settings. Data Inconsistencies: There could be inconsistencies in the data related to the items being transported, such as incorrect classification or missing dangerous goods information. Mapping Rules: The mapping rules defined in the system may not be correctly set up to handle the specific item data for the trip.
Solution: Check Item Data: Review the item data associated with the trip (trip &1) to ensure
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/SCTM/EHS_DG027 Error when determining selection date (valid from-to)
What causes this issue?  An error occurred in the BAdI implementation of the interface method /SCTM/IF_EX_EHSDG_BADI_01~MAP_REQUEST_HEADER for date de...
/SCTM/EHS_DG026 No active implementation of BAdI &1 exists
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SCTM/EHS_DG029 Dangerous goods indicator profiles could not be determined
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SCTM/EHS_DG030 Item &1 is not check-relevant and is not checked
What causes this issue?  The product &V2& has the dangerous goods indicator profile &V3&. No dangerous goods checks are required with ...
Click on this link to search all SAP messages.