Message type: E = Error
Message class:  OIJ_TSW_07 - Message Class for Ticketing APP developments 
Message number: 020
Message text: Enter a valid UoM
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_TSW_07020, which states "Enter a valid UoM" (Unit of Measure), typically occurs in the context of SAP Oil and Gas or similar modules where unit of measure (UoM) is critical for transactions involving quantities of products, materials, or services.
Cause: Invalid UoM Entry: The UoM entered in the transaction is not recognized by the system. This could be due to a typo, an unsupported UoM, or a UoM that is not configured in the system. Missing UoM Configuration: The UoM may not be defined in the relevant master data (e.g., material master, service master). Inconsistent UoM: The UoM may not be compatible with the product or service being processed, leading to inconsistencies in the transaction. User Authorization: The user may not have the necessary permissions to use certain UoMs.
Solution: Check UoM Entry: Verify that the UoM entered is correct. Ensure there are no typos and that it matches the expected format. Review UoM
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
OIJ_TSW_07019 Enter Quantity UoM
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_TSW_07018 Enter a valid Nomination Item
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_TSW_07021 Enter a valid  Meter Number
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_TSW_07022 Carrier is blocked
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.