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Hey @Nicolas can you please take a look at all this ?

All this started when I realised we probably do not want to allow grouping reference to be set when we have transactions from different ledgers ( edda8b58 ) and then realized it would be required to allow choosing ledger in grouping fast input instead of just showing all ledgers together ( d1ecbe29 ).

The rest are small changes to move out complex logic from TALES to a script and small fixups.

Thanks

/reviewed-on nexedi/erp5!170