Balance carried forward in P&L nominal code

SUGGESTED

We have rolled forward our Sage system from 2020 into 2021.

One of our P&L codes was saved as a balance sheet code so there is a balance sat on the P&L code for £12k from prior year and the brought forward reserves is now £12k out for the same reason. How would I move the balance that's on the P&L code to the reserves (3200)?

If I post a journal in the current year then that would mean I'm creating a false credit in my P&L.

I'm trying to find a way to reallocate the balance without doing a journal. Is that possible?

In the current year we have now corrected the relevant nominal code to be a P&L one and not a balance sheet code as it was in 2020.

Any help on this would be gratefully received.