Multiperiod accounting Execusion report is empty and then populated

Summary:

At month end, the the Create Multiperiod accounting was ran 4 times within 4 hours. There was no additional multiperiod invoice entered.

So for same period and same list of accounting events (and the create accounting scheduled every 10mn). No change between 2 runs: the first execution report is empty, next is populated

Did anybody experience the same and know what happened?

Thanks

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