Message type: E = Error
Message class:  RSO_CTC - Message class for CTC related messages 
Message number: 127
Message text: BDLS task has wrong mapping for system &1; it must be a BW source system
You have chosen to copy BW Source system &V1& as well. The
<ZK>Conversion of Logical System Names</> task will therefore convert
all references of the original BW Source system (copied from) with the
target BW Source system &V1& (Copied to). In the <ZK>Parameter</> dialog
of the <ZK>Conversion of Logical System Names</> task, the mapping of
system &V1& is not maintained correctly however. &V1& has to be mapped
to the original BW source system.
Errors will appear if the FROM value is not a BW source system or is
left blank.
Conversion of logical system names will result in errors.
Enter a valid logical system name for the mapping of system &V1& in the
<ZK>Parameter</> dialog of the <ZK>Conversion of Logical System Names</>
task.
If the logical system name of the original BW source system is not
maintained, enter it in the <ZK>FROM</> field.
If the logical system name of the target BW source system is not
maintained, enter it in the <ZK>TO</> field
The <ZK>FROM</> value should be mapped to the <ZK>TO</> value.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message RSO_CTC127 indicates that there is an issue with the mapping of a system in the context of a BDLS (Batch Data Load Service) task. Specifically, it states that the system in question must be a BW (Business Warehouse) source system. This error typically arises during the process of converting or migrating data between different systems, particularly when dealing with BW data sources.
Cause: The error occurs when the system mapping in the BDLS task is incorrectly configured. This can happen due to several reasons: Incorrect System Type: The system that is being referenced in the BDLS task is not recognized as a BW source system.
Configuration Issues: There may be misconfigurations in the BW system settings or in the BDLS task itself. Data Source Changes: If the data source has been changed or if the system landscape has been modified, it may lead to this error. Version Compatibility: There may be compatibility
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
RSO_CTC126 Source system &1 is still connected to BW system &2
What causes this issue?  The source system &V1& is still connected to the BW system &V2&.System Response  The re-connection of the sou...
RSO_CTC125 Source system &1 will be remotely re-connected to BW
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSO_CTC128 &1 mapped in UI of BDLS task is not a valid BW source system
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSO_CTC129 BDLS UI contains mappings to logical system &1. Remove this mapping.
What causes this issue?  In accordance with the selections defined in the <ZK>Select System Connections to be Retained After Copy</> task,...
Click on this link to search all SAP messages.