We use Evo, but we reverse WO's regularly, mostly without problems. Here is what we do and what we get...
 
We re-open the WO, if closed. Then run WO-I, hitting F2 and the first (date) field, where we look up the transaction we want to reverse.
 
When found, we select the transaction, which returns us to the WO-I screen where we hit Tab and get the question about reversing the transaction. We say Yes and the portion of the transaction that put the finished item into stock is reversed.
 
At that point all components are still in WIP. If we want to clear all parts back out of the WO, including type N and type L items on the BOM, we just use WO-J to cancel the order and all parts "Un-backflush" into inventory.
 
The only time we have problems is when there are serialized components that were issued to the WO, but that is not often the case.
 
This works for us and we use it about 3 or 4 times per week.

Ah. For WO-G I always issue a negative quantity to un-issue items or kits.

I used that technique mostly for un-scrapping items expensed to indirect WOs. We kit issue and then make small adjustments. Neither of these scenarios lend themselves to undoing previous transactions.