Message type: E = Error
Message class:  CNV_OM_MWBGEN - SLO: Messages for Object Based MBW Generation 
Message number: 051
Message text: Sender Container: Field &2 of DDIC structure &1 could not be resolved
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 CNV_OM_MWBGEN051 indicates that there is an issue with the Data Dictionary (DDIC) structure in the context of a conversion or migration process, typically related to the SAP Landscape Transformation (SLT) or other data migration tools. The error specifically states that the field in the specified DDIC structure could not be resolved, which means that the system is unable to find or access the specified field in the given structure.
Cause: Field Name Typo: There may be a typo in the field name or the structure name in the configuration or mapping settings. Missing Field: The field might not exist in the specified DDIC structure. This could happen if the structure was changed or if the field was deleted. Transport Issues: If the DDIC structure was recently transported from another system, it may not have been properly activated or may not exist in the target system. Authorization Issues: The user executing the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_OM_MWBGEN050 Sender Container: DDIC structure &1 could not be resolved / created
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_MWBGEN047 Settings have not been saved
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_MWBGEN055 Receiver Container: DDIC structure &1 could not be resolved / created
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_MWBGEN056 Rule &1 will be deleted from reference object &2
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.