Hi JauB,
In the very first phase Patching Data is something which should be considered as last option. It is always not recommended or best practice do it. You may not Know what will the the out comes if you patch data. In your case we aren't sure on which source document your Inventory unit is wrong, You are talking on table level.
If you want patch data, Take a back-up and than test all possible scenarios so that you can be rest assured that there wont be any implications.
Thanks
Nagendra Varma K