Message type: E = Error
Message class:  OIJ_RU - Messages for TSW-ETRAN integration 
Message number: 200
Message text: Enter both partner number and partner object
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 OIJ_RU200 ("Enter both partner number and partner object") typically occurs in the context of SAP Oil and Gas (OIJ) when a user is trying to create or modify a business partner relationship but has not provided the necessary information for both the partner number and the partner object.
Cause:
This error arises when:
The user attempts to create or update a business partner relationship without entering both the partner number and the partner object.
The system requires both pieces of information to establish a valid relationship between business partners in the SAP system.
Solution:
To resolve this error, you should:
Check Input Fields: Ensure that both the partner number and the partner object fields are filled in correctly. 
The partner number typically refers to the unique identifier for the business partner.
The partner object refers to the type of relationship or the specific object associated with the partner (e.g., customer, vendor, etc.).
Validation: Make sure Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
OIJ_RU102 Enter currency for the freight declared value
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_RU101 Cannot perform ticket actualization
What causes this issue?  The system cannot actualize the ticket due to one of the following reasons: The status of the ticket is not <LS>Approve...
OIJ_RU300 Enter table name
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_RU301 Enter field name or text ID
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.