fixup! accounting: fix validation of accounting transactions with too precise amounts

there was also another script for internal
6 jobs for arnau in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

04:40:19

failed ERP5.UnitTest-TestRunner2

05:52:30

passed ERP5.CodingStyleTest-TestRunner2

08:19:21

passed ERP5.CodingStyleTest-TestRunner2

07:30:54

failed ERP5.UnitTest-TestRunner2

07:38:33

failed ERP5.UnitTest-TestRunner2

04:50:46