Sell Real Estate & Buy New from other source and still gain tax exemption

I want to sell a property A and buy another property B. Let us say I sell  property A to get X lakhs, but during this selling period I already paid advance Y lakhs to buy another property B from my other savings. Later on I paid the remaining amount for B from the X lakhs I got from the property A.

Can I still claim the capital gain exemption for reinvesting in a new real estate though I paid partial amount from my other sources or I need to show to IT that full amount was paid from the X lakhs that I got from property A.