undo G/L Entry posted

Exist anyway to undo a posted G/L entry?

I think in old versions exists a codeunit to test one entry and make an invisible entry in te G/L table to mantain the consistence of DB and insert into one special journal the same line again to re-post it.

Of course this will be done with all the lines of the same transaction number and test if this trans afects to Customers, supliers and others documente.

Anyone who knows about this can help me?

TIA