Thanks for quick response.
I tried your suggestions but no luck.
I realise that this was a more or less 'undocumented feature' meant for use by Accountants and not for the casual users. However, it found it a very useful tool when we did the re-design of our CoA. We have some further changes to the CoA and wanted to use it again.
I followed your other suggestion, to do it by individual transaction.
In one of the comments on a YouTube video ( https://www.youtube.com/watch?v=fU4jLbckpN8) I read that the Reclassify Tool could only be available in the US. if so, would you be able to confirm?