Thanks a lot for all your responses. All this reading and analyzing make me find the answer!! And the problem was that I was assigning a class to the Account Receivable (and to the Account Payable too) so QBO use that one to the register automatically created when I made the deposit.

So, the solution was to errase the class on every deposit that was made to the account "Account Receivable"!!!.

And I did the same with the manual payments I register using the account "Account Payable".

Conclusion: Do not assign classes to the Account Receivable or the Account Payable, the proper class will be "take" from the Invoice or from the Bill on each case to report purposes!!! 

Best regards

A happy user!!!