Message type: E = Error
Message class:  >REP -  
Message number: 405
Message text: Returns lot transfer running - generation not possible
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 REP405 ("Returns lot transfer running - generation not possible") typically occurs in the context of handling returns and inventory management within the SAP system. This error indicates that there is an issue with the processing of a returns lot transfer, which is often related to the status of the lot or the system's ability to generate the necessary documents or records for the transfer.
Causes:
Ongoing Process: The error may occur if there is already an ongoing process related to the returns lot transfer. This could mean that another transaction is currently being processed for the same lot, preventing new transactions from being initiated.
Lot Status: The lot may be in a status that does not allow for further processing. For example, if the lot is blocked or has been marked for a specific purpose that prevents its transfer.
Configuration Issues: There may be configuration settings in the SAP system Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
>REP404 Payment advice &1: No more items can be added
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
>REP403 Payment advice transfer &2 is being used by user &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
>REP500 *----- Events
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
>REP501 Keyword not found: &1
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.