Message type: E = Error
Message class:  CNV_IUUC_TCR_MAIN - transactional consistent replication main package 
Message number: 030
Message text: rfc system error in destination &1: &2
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The SAP error message CNV_IUUC_TCR_MAIN030 typically relates to issues encountered during the execution of a data migration or transformation process, particularly in the context of the SAP Landscape Transformation (SLT) or SAP Data Services. The error message indicates that there is an RFC (Remote Function Call) system error in the specified destination.
Cause: The error can be caused by several factors, including but not limited to: Network Issues: There may be connectivity problems between the source and target systems. RFC Destination Configuration: The RFC destination may not be correctly configured or may be pointing to an incorrect system. Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to perform the required operations. System Availability: The target system may be down or not reachable at the time of the operation. Resource Limitations: The target system may be experiencing resource limitations (e.g., memory, CPU) that prevent it from processing the request.
Solution: To resolve
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