Hi, Roshan, 
From your message it is hard to guess if expense account is wrong or periodic allocation itself. Anyway, to correct it, regular process should be used: you need opposite entry (wrong account/allocation) and correct one (with correct account or allocation). 

You can cancel and recreate supplier invoice or use manual voucher to rectify, if invoice is paid and it is not practical to recreate it.

Hi @Adam Bereda 

Thank you for your reply.

Period allocation is correct but we have used a wrong expense account. Invoice is already in PaidPosted state and period allocation has been done for 3 months so cancel and recreate supplier invoice is out of the equation. Appreciate if you could explain how we could use a manual voucher to rectify the issue .

Regards, Roshan.

please book manual voucher with two lines:

1. Incorrect expense account, amount opposite to original entry (before allocation, i.e. full allocated amount). 
2. Correct expense account, with amount of original entry.

Then use period allocation function on both rows of manual voucher, allocating them to periods 1-12 of 2022. 

In case of closed periods, relevant amount should be added to first available period.

Hi @Adam Bereda ,

Thank you so much for your support. It worked.

Regards, Roshan.