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How to know when a value is null for the first time in a sequence of run by changes?

Summary:

How to know when a value is null for the first time in a sequence of run by changes?

Content (required):

My HCM Extract is daily scheduled. Only values that change from a run to the other one are written in the output file. These are 3 variables that changes over 3 consecutive runs:

1) First time every value is extracted:

CurrentDate = 21/07/2023

CompensationEndDate = 22/07/2023

CompensationValue = 100


2) Second time nothing changes so no value is extracted

CurrentDate = 22/07/2023

CompensationEndDate = 22/07/2023 (CompensationEndDate_OLD = 22/07/2023) but since it's equal to its previous value it doesn't show on output

CompensationValue = 100 (CompensationValue _OLD =100) but since it's equal to its previous value it doesn't show on output

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