Message type: E = Error
Message class:  CNV_CDMC_CA - CDMC Clearing Analysis 
Message number: 088
Message text: Project ID is reserved by the user &1
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_CDMC_CA088 indicates that a specific Project ID is reserved by a user, which means that the project cannot be accessed or modified by other users until the reservation is released. This error typically occurs in the context of data migration projects using the SAP Conversion Tools.
Cause: The error is caused by a user reserving a Project ID for their own use, which prevents other users from accessing or modifying that project. This is a mechanism to ensure that multiple users do not interfere with each other's work on the same project.
Solution: To resolve this error, you can take the following steps: Identify the User: Check which user has reserved the Project ID. This information is usually available in the error message or can be found in the system logs. Contact the User: If possible, contact the user who has reserved the Project ID and ask them to release it if
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CDMC_CA087 Severity of selected objects has been changed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDMC_CA086 &1 terminated in the following systems &2
What causes this issue?  The activity has terminated in some of the defined systems.System Response  The system issues an error message and will not a...
CNV_CDMC_CA089 Activity & is already completed
What causes this issue?  You want to execute an activity that is already completed. You can only execute activities of this type if an error occurred ...
CNV_CDMC_CA090 No data found for activity or activity has not been started
What causes this issue?  You have attempted to view the result of an activity, but no data found corresponds to the clicked activity in the system, or...
Click on this link to search all SAP messages.