Message type: E = Error
Message class:  /IWBEP/MC_SB_DPC_ADM -  
Message number: 030
Message text: The data source provider &2 is not allowed to redefine the interface &1
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.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message /IWBEP/MC_SB_DPC_ADM030 indicates that there is an issue with the data source provider trying to redefine an interface that it is not allowed to. This typically occurs in the context of SAP Gateway and OData services, where a data source provider (like a service or a model) is attempting to implement or redefine an interface that has already been defined elsewhere.
Cause: Interface Redefinition: The error usually arises when a data source provider attempts to redefine an interface that is already defined in the system. This can happen if: The same interface is being implemented by multiple providers. There is a mismatch in the implementation of the interface. The provider is not authorized to redefine the interface due to system constraints or settings.
Configuration Issues: There may be configuration issues in the OData service or the data source provider that prevent it from correctly implementing the interface. Versioning Conflicts: If there are multiple versions
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/IWBEP/MC_SB_DPC_ADM029 Failed to implement the methods for interface &1.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWBEP/MC_SB_DPC_ADM028 The interface &1 is of type Modeled only. Process canceled.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWBEP/MC_SB_DPC_ADM031 The method &2 in data source provider &1 does not exist in interface &3
What causes this issue?  The method name supplied by the data source provider class above, does not exist in the specified interface.System Response  ...
/IWBEP/MC_SB_DPC_ADM032 The data source provider &1 is not allowed to redefine the method &2
 <ZK>&CAUSE&</> You are not allowed to redefine any of the following methods: <ZK>GET_ENTITY</> <ZK>GET_ENTITYSE...
Click on this link to search all SAP messages.