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An expression analysis works as expected with backfilling but not when it runs normally

Question asked by RonaldDuinmeijer on Nov 28, 2016
Latest reply on Dec 1, 2016 by tmcmanus

With preview results or with backfilling I get the expected results. But otherwise I don't get the expected results I miss values in my output tag.
The expression is as below
If PrevVal('Procesfase', '*') = 20 And 'Procesfase' <> 20 Then 1 Else If PrevVal('Ladingnummer','*') <> " 0000" And 'Ladingnummer' = " 0000" Then 0 Else NoOutput()

The expression is triggered by the attributes Procesfase and Ladingnummer.

The output tag definition see screen print below