Lease creation clarification

Dear Experts,

I have one functional doubt about lease creation in property manager module. We defined the property , building , floors and offices. Now we are trying to enter the revenue lease using “Main Lease” window. I noticed that there is no place where I can enter the exact Square meter which we need to allocate to a customer in a specific lease. I found fields like “Lease Rentable Area” but if we enter the actual square meter for this lease agreement, this is not getting updated in the space assignment window.

Eg: Suppose we need to allocate floor A to a lease. Total usable area defined in property definition window for floor A is 1000 Square meter.