Message type: E = Error
Message class:  CNV_PE - General messages for posting engine 
Message number: 343
Message text: Parameter &1 cannot be transformed with variable in fix value
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_PE343 indicates that there is an issue with a parameter that cannot be transformed using a variable in a fixed value context. This typically occurs in the context of data migration or conversion processes, particularly when using the SAP Conversion Tools or during the execution of a conversion program.
Cause: The error is usually caused by one of the following reasons: Incorrect Parameter Configuration: The parameter specified in the conversion program is not set up correctly, or it is not compatible with the expected data type or format. Use of Variables: The system is trying to use a variable in a context where a fixed value is expected, which leads to a conflict. Data Type Mismatch: There may be a mismatch between the expected data type of the parameter and the actual data being processed. Missing or Incorrect Mapping: If the mapping of the source and target fields is not correctly defined,
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_PE342 Transformation rule &1 does not exist
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE341 SND_PAR parameter &1 must be of type &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE344 Sender parameter on structure (STR) level is initial
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE345 Sender parameter on relevance identifier (RELV_ID) level is initial
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.