Message type: E = Error
Message class:  APB_FPM_GUIBB -  
Message number: 115
Message text: Drop target exists already
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 APB_FPM_GUIBB115: Drop target exists already typically occurs in the context of the Floorplan Manager (FPM) when working with the UI components of an SAP application. This error indicates that there is an attempt to add a drop target (like a UI element where items can be dragged and dropped) that already exists in the application.
Cause: Duplicate Drop Target: The most common cause of this error is that the application is trying to create a drop target that has already been defined in the UI configuration.
Configuration Issues: There may be issues in the configuration of the FPM application, such as incorrect settings in the configuration files or the UI component settings. Custom Development: If there are custom developments or enhancements made to the FPM application, they might inadvertently create duplicate drop targets.
Solution: Check Configuration: Review the FPM configuration to ensure that there are no duplicate definitions for drop targets. This
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
APB_FPM_GUIBB114 Missing drop target ID
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APB_FPM_GUIBB113 Action &1 exists already
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APB_FPM_GUIBB116 Missing menu ID
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APB_FPM_GUIBB117 Menu &1 exists already
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.