Message type: E = Error
Message class:  FKK_CRM - Messages for FI-CA CRM Integration 
Message number: 019
Message text: No correspondence entry exists after call of event 795
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 FKK_CRM019 ("No correspondence entry exists after call of event 795") typically occurs in the context of the Contract Accounts Receivable and Payable (FI-CA) module when there is an issue related to the correspondence processing for a customer account. This error indicates that the system could not find a correspondence entry after an event was triggered, which is often related to billing or payment processing.
Causes:
Missing Correspondence Entries: The most common cause is that there are no correspondence entries created for the specific event (event 795) that was triggered.
Incorrect Configuration: The configuration for correspondence processing may not be set up correctly, leading to the system not being able to find the necessary entries.
Data Inconsistencies: There may be inconsistencies or missing data in the relevant tables that store correspondence information.
Event Triggering Issues: The event that was supposed to create the correspondence entry may not have been triggered correctly due Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FKK_CRM018 No authorization for transaction FKKCRM_AUTH_CHECK (User &1)
 trados = fiWhat causes this issue?  All RFC modules of <LS>Financial Customer Care</> contain a standard check (<LS>S_TCODE</>...
FKK_CRM017 Internal Error: GUID of Clarification Case 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...
FKK_CRM020 Could not read dunning history
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_CRM021 Printer parameters missing in user data for &1 in ERP system
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.