Hi,
The ABC indicator in the maintenance item is under the Item location tab and all data in this tab is fetched from Functional location or Equipment master data for which you have created maintenance item. If you want to change then you might have to go back to FL or EQP and change in master record. Because there is no field holding this value in maintenance item table MPOS, all details under this screen are fetched from reference object master tables at runtime.
But if you still want to do it then go for enhancement.
Thanks,
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