Message type: E = Error
Message class:  IST_EBS - Interface Between IS-T and External Billing System 
Message number: 195
Message text: A mass activity is already stored for user key &1
A mass run is already defined for the key you are using.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
If this error occurs when you call the IST_EBS_EXT_START_MASS_ACT
function module, then you must enter a new run identification trunk, as
this is used for the user key that is automatically created.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message IST_EBS195, which states "A mass activity is already stored for user key &1," typically occurs in the context of mass activities in SAP, particularly when dealing with Electronic Bank Statement (EBS) processing or similar mass data operations. This error indicates that there is already an ongoing or previously stored mass activity associated with the specified user key.
Cause: Duplicate Mass Activity: The error is triggered when a user attempts to initiate a new mass activity (like processing bank statements) that conflicts with an existing one that has the same user key. Session Management: The system may not have properly cleared a previous session or transaction, leading to the perception that a mass activity is still active. User Key Conflict: The user key is a unique identifier for the mass activity, and if it is already in use, the system will prevent new activities from being initiated with the same key.
Solution: Check
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