Duplicates when using [_RowNumber]

I have an app whereby each job gets allocated [Job Number] based on [_RowNumber]+40000 as an App Formula.  The issue seems to be that in certain senarios  the following happens:

  • User A starts to adds a record, [Job Number] = 41000 because row 1000 is still blank
  • User B starts to adds a record, [Job Number] = 41000 because row 1000 is still blank
  • User A saves the record so where [_RowNumber] = 1000,  [Job Number] = 41000
  • User A saves the record so where [_RowNumber] = 1001,  [Job Number] = 41000

I'm thinking the best way to solve this is to have an action on Form Saved to write [Job Number].  Any better suggestions?

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