Thank you very much for answering and clarifying the semantic error that induces me to understand more the subtle details. Bitcoin-core wallett app induces me to increase the network quota for a previous payment in magnitudes of -0.00028725 ; so no more; I in my ignorance interpret that all BTC fractions are represented and are equivalent to satoshi. I had seen badly the true equivalence by its subtle fraction. Thanks again, but I still can't enjoy my BTC fractions, some new help, please.