Message type: E = Error
Message class:  OIJ_RU - Messages for TSW-ETRAN integration 
Message number: 011
Message text: Enter one partner only
You have made entries for several partner objects (customer, vendor,
plant, or storage location), however, you can create data for only one
partner object at the same time.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Make an entry in one of the partner object fields only (either customer,
vendor, plant, or storage location).
Error message extract from SAP system. Copyright SAP SE.
The SAP error message OIJ_RU011 "Enter one partner only" typically occurs in the context of the SAP Oil and Gas (OIJ) module, particularly when dealing with partner functions in business transactions. This error indicates that the system expects only one partner to be entered for a specific transaction, but multiple partners have been provided.
Cause: Multiple Partner Entries: The most common cause of this error is that the user has entered more than one partner in a field that only allows a single partner. This could happen in various scenarios, such as when creating or modifying a business transaction, contract, or document.
Configuration Issues: There may be configuration settings in the SAP system that dictate how partners are managed, leading to restrictions on the number of partners that can be entered. Data Entry Errors: Users may inadvertently select multiple partners due to misunderstanding the input requirements or interface.
Solution: Review Partner Entries: Check the partner fields
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