Partly paid invoice in cash

I submit my customer an invoice. There has been paid some amount of money and now I want to book it as by a cash entry.
But how can I book it debit on the invoice, so I could mark the paid rules on the invoice? I have tried many times to book this payment, but it causes new sales in my profit & loss statement. Do I to make use of a journal statement?

Who will help me to solve this problem?

To book it as a cash entry, go to Cash Accounts tab and select cash account to be used.
Click Receive Money and fill in the fields, for the Account field select Accounts Receivable then Customer and Invoice.

You should also read the Guides related to cash accounts and customers: