How do I access a local variable in a standard method? E.g. the assetTransNew variable in the createAssetTrans method of the TransactionReversal_Asset class.
Why? For every new AssetTrans record created by this method, I have to create a related record using the RecId of the assetTransNew record and some other fields.
It's impossible. A CoC extensions allows you to add code before the method gets called or after that; you can't touch anything inside. The variable simply doesn't exist in your code, it either hasn't been declared yet or it was already destroyed.
Therefore you need to come with with a different design. Either you'll find a way how to do it with extensions, or you'll need to create an extensibiilty request to make the method extensible.
For example, couldn't you use those updateAssetBookOrigRevoke() and updateAssetBookOrigReversal() methods? There you have the table buffer in _assetTrans parameter.
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