Message type: E = Error
Message class:  RSO_RES_ADSO - Datastore Object 
Message number: 009
Message text: M and A version of DataStore object '&1' are different
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The SAP error message RSO_RES_ADSO009 indicates that there is a mismatch between the M (Master) and A (Active) versions of a DataStore Object (DSO) in SAP BW/4HANA or SAP BW on HANA. This error typically arises when there are inconsistencies between the data model definitions or when changes have been made to the DSO structure that have not been properly synchronized.
Cause: Model Changes: The structure of the DSO has been modified (e.g., adding or removing fields) in one version (either M or A) but not in the other. Transport Issues: If the DSO was transported from one system to another, the transport might not have included all necessary changes, leading to version mismatches. Manual Changes: Manual changes made directly in the database or through other means that do not reflect in the DSO's metadata can cause this issue. Inconsistent Activation: If the DSO was activated in a way that did not properly update both
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