The error message AAPO189 in SAP ERP can indeed be problematic, especially if it interrupts the booking process and there is no direct way to switch to a warning message via OBA5 or similar customizing settings. ### Steps to solve the problem 1. Analyze the message - First check exactly what the error message AAPO189 says. Sometimes the text of the error message gives important clues as to which configurations or data need to be adjusted or checked. 2. Check the business unit configuration - The business unit plays a central role here. It could be that the different business areas of the assigned objects are subject to a special check (in standard SAP or through a customer-specific adjustment). 3. Customizing the error messages - You already mentioned that no option was available in OBA5. It would be advisable to check again all relevant settings in the transactions OBA5, OBMSG, or similar, to make sure that no option has been overlooked. 4. Review of customizing for business areas - Go to the customizing settings for business areas and check if there are specific requirements or restrictions for postings. This could be considered under the maintenance of account assignment objects to be posted. 5. Analyze and test in a quality assurance environment - Perform tests in a non-production environment to simulate different scenarios of configuration changes without affecting the production system. This will help you to understand what the consequences of a change might be. 6. SAP Notes and SAP Support - Search for relevant SAP Notes that might relate to the specific problem. Sometimes there are already patches or hints on how to handle such issues. SAP support can also provide clarity, especially if the solution requires in-depth knowledge of the SAP system. 7. Custom development - If no standard solution is available, it could be an option to program a small customization (user exit or BAdI) that overrides the validation in specific cases. However, this should be done carefully and in consultation with an SAP development team ### Conclusion Be careful when manipulating standard error messages as these are often implemented to protect data integrity and business logic. Sometimes customizing the processes or data, rather than the system itself, can be a more secure solution. Contact your SAP consultant or the support team if you need assistance with this.
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