Message type: E = Error
Message class:  LXE_TD_DOWNLOAD - Messages for Batch Download of Translated Texts for TM 
Message number: 021
Message text: Source and target language are identical
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 LXE_TD_DOWNLOAD021 indicates that there is an issue with the translation download process where the source and target languages are identical. This typically occurs when you attempt to download translations for a language into the same language, which is not a valid operation.
Cause: The error arises when: You are trying to download translations for a specific language (e.g., English) and have mistakenly set the target language to the same language (e.g., English). The system does not allow downloading translations into the same language because there are no changes or translations to be made.
Solution: To resolve this error, you should: Check Language Settings: Ensure that the source and target languages are different. For example, if you are downloading translations from English (EN) as the source language, set the target language to a different language (e.g., German (DE), French (FR), etc.). Correct the Download Request: If you are using a transaction code (like SE63 for
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
LXE_TD_DOWNLOAD020 Select a valid language
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LXE_TD_DOWNLOAD018 Only these characters are allowed in the path: 'a-z' 'A-Z' '0-9' '/' '_'
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LXE_TD_DOWNLOAD022 There are no translated objects in worklist (&1) for &2->&3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LXE_TD_DOWNLOAD023 Only translation statuses 'M' (modified) or 'T' (translated) allowed
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.