Message type: E = Error
Message class:  SDDIC_CSN - CSN Exporter Runtime Messages 
Message number: 016
Message text: Failed to read SQL on condition of association &1 in entity &2.
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 SDDIC_CSN016 indicates that there was a failure in reading SQL due to a condition associated with a specific entity. This error typically arises in the context of SAP's data modeling and database access, particularly when working with Core Data Services (CDS) views or similar constructs.
Cause: The error can be caused by several factors, including: Incorrect Association Definition: The association defined in the CDS view may not be correctly set up, leading to issues when trying to read data. Missing or Incorrect Data: The underlying data in the database may be missing or not conforming to the expected structure, which can lead to SQL read failures. Authorization Issues: The user executing the query may not have the necessary authorizations to access the data or the associated entities. Database Connectivity Issues: There may be issues with the database connection or the database itself that prevent the SQL from being executed properly. Syntax Errors: There
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
SDDIC_CSN015 Parameter &1 of entity &2 not found.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SDDIC_CSN014 Entity &1 uses parameters or filter in &2. CSN element quey is empty.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SDDIC_CSN017 Failed to read CDS on condition of association &1 in entity &2.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SDDIC_CSN018 Query not exported. Element &2 of entity &1 has unsupported expression.
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.