Hi
Your table is standard, you hav not gambled with standard error message and still system allowing you to do this 
Yes you should raise an OSS note to SAP. They can check it and help you in this because this not as it should be.
If you have access and time you can find existing notes on sap service market place by search term VKOA or account determination table in SD etc. May be some exisiting note could solve this issue.
Thank$