Message type: E = Error
Message class:  TU - Billing/Scheduling/Budget Billing 
Message number: 418
Message text: Contr.&1: Corr.work for original portion &2 differs from alt.portion &3
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 TU418 indicates a discrepancy between the correction work for the original portion and the alternative portion in a transport request. This typically occurs in the context of transport management, where changes made in the development environment need to be transported to the quality or production environments.
Cause: The error message TU418 can arise due to several reasons: Inconsistent Transport Request: The transport request may have been modified or inconsistently maintained, leading to differences between the original and alternative portions. Manual Changes: If manual changes were made to the objects in the transport request after it was created, it could lead to inconsistencies. Multiple Developers: If multiple developers are working on the same objects and changes are not properly synchronized, it can lead to discrepancies. Transport Layer Issues: Problems with the transport layer or configuration can also lead to this error.
Solution: To resolve the TU418 error, you can follow these steps: Check Transport Request: Review
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
TU417 Contr.&1 Factory calendar for orig.portion &2 differs from alt.portion &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
TU416 Contr.&1: End of bill.per.for orig.portion &2 differs from alt.portion &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
TU419 Contr.&1: Period length of alternative portion &2 is not permitted
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
TU420 Cannot delete due to schedule record of &1 &2 for &3
What causes this issue?  A number of the following exist for the schedule record for &1 &2, with the scheduled billing/meter reading date &...
Click on this link to search all SAP messages.