Message type: E = Error
Message class: FRE - F&R CON R/3 - Messages
Message number: 644
Message text: RFC undefined Error
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FRE644
- RFC undefined Error ?The SAP error message FRE644, which indicates "RFC undefined error," typically arises in the context of Remote Function Call (RFC) communications between SAP systems or between an SAP system and an external system. This error can occur due to various reasons, and understanding the cause is essential for troubleshooting and resolving the issue. Causes of FRE644 RFC Undefined Error Network Issues: Problems with the network connection between the SAP systems can lead to RFC errors. This includes issues like firewalls blocking the connection, network outages, or misconfigured network settings. RFC Destination Configuration: The RFC destination may not be correctly configured in the SAP system. This includes incorrect parameters such as the target system's IP address, system number, or client. Authorization Issues: The user credentials used for the RFC call may not have the necessary authorizations to execute the requested function module. Function Module Not Found: The function module being called may not exist in the
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