How To Fix NSDM_MIG_CONTROL161 - Aggr. &1, max. no. of dir. predecessors &2, actually &3 - not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: NSDM_MIG_CONTROL - Log message for migration

• Message number: 161

• Message text: Aggr. &1, max. no. of dir. predecessors &2, actually &3 - not supported

Self-Explanatory Message

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message NSDM_MIG_CONTROL161 - Aggr. &1, max. no. of dir. predecessors &2, actually &3 - not supported ?

  The SAP error message NSDM_MIG_CONTROL161 typically occurs in the context of data migration or data modeling within SAP systems, particularly when dealing with aggregation levels in SAP BW (Business Warehouse) or SAP HANA.
  Cause:
  The error message indicates that there is an issue with the number of direct predecessors for an aggregation level. Specifically, it states that the maximum number of direct predecessors allowed for the aggregation level has been exceeded. The message provides three parameters:
  
  &1: The name of the aggregation level.
  &2: The maximum number of allowed direct predecessors.
  &3: The actual number of direct predecessors currently associated with the aggregation level.
  
  This situation can arise due to:
  
  Incorrect configuration of the aggregation level.
  An attempt to add too many data sources or InfoProviders to a single aggregation level.
  Changes in the data model that have not been properly reflected in the aggregation level settings.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Aggregation Level Configuration:
  
  Go to the aggregation level in question and check its configuration.
  Ensure that the number of direct predecessors does not exceed the maximum limit set by the system.
  
  
  
  Reduce Direct Predecessors:
  
  If the number of direct predecessors exceeds the limit, consider removing some of them. This may involve re-evaluating the data sources or InfoProviders that are linked to the aggregation level.
  
  
  
  Check System Documentation:
  
  Refer to SAP documentation or notes related to the specific version of your SAP system to understand the limitations regarding aggregation levels and direct predecessors.
  
  
  
  Consult SAP Support:
  
  If you are unable to resolve the issue through configuration changes, consider reaching out to SAP support for assistance. They may provide insights or patches if this is a known issue.
  
  
  
  Testing:
  
  After making changes, test the aggregation level to ensure that it functions correctly without triggering the error message.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can share their solutions.
  Documentation: Review the SAP BW or HANA documentation for best practices on managing aggregation levels and understanding their limitations.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.