Tax Return box 44 and 45

So I am trying to work out my tax return and just needed some clarification over these two boxes

44 Residential property finance costs vs 45 Unused residential property finance costs
brought forward

I am aware that I am aloud to claim interest already paid on my mortgage in the last tax year.

But it’s a bit unclear which box I need to fill out?

It’s 44 I need as 45 is for unused

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