Compare 2 consecutive rows of a column in PBI - powerbi

Question

I would like to compare 2 consecutive rows of the same column ("Niveau num") of a table in PBI and display the result of this comparison in another column ("Niveau arbre"). This can be done very easily in Excel but Power BI is online and it is more complicated to set it up.
I added an index column to have access to the row number and I wrote the following formula in Power Query:
= Table.AddColumn(#"Colonnes permutées", "Niveau arbre", each if Estimations[Niveau num]{[Index]} > Estimations[Niveau num]{[Index]+1} then 1 else 0, type number)
screenshot
I then get the error:
Expression.Error : A cyclic reference was detected during the evaluation.
Here is all the code:
let
Source = Access.Database(File.Contents("C:\Users\T0275244\Desktop\BDD Access PBI\Off\BDD-Off.accdb"), [CreateNavigationProperties=true]),
_Estimations = Source{[Schema="",Item="Estimations"]}[Data],
#"Personnalisée ajoutée" = Table.AddColumn(_Estimations, "Niveau num", each List.Sum(List.Transform(Text.ToList([WBS]), each if _ = "." then 0 else 1))),
#"Lignes filtrées" = Table.SelectRows(#"Personnalisée ajoutée", each [WBS] <> null and [WBS] <> ""),
#"Type modifié" = Table.TransformColumnTypes(#"Lignes filtrées",{{"Niveau num", Int64.Type}}),
#"Index ajouté" = Table.AddIndexColumn(#"Type modifié", "Index", 1, 1, Int64.Type),
#"Colonnes permutées" = Table.ReorderColumns(#"Index ajouté",{"Devis", "WBS", "Désignation", "Qté", "Respde Lot niveau2", "Centre de taux", "Activity", "Activities", "ECPS/Transverse", "SW Comp", "MO ING", "MO TECH", "Total MO (H)", "Total MO (K€)", "Autres MO", "Total MO et Autre MO", "Total tarifs (PRV)", "Divers CPP", "Total MO et Div Tarifs", "Durée ID Ingé", "Nb de Voyages", "Divers transports", "Total Frais Déplacement", "INTRAGROUP PURCHASES", "EXTERNAL PURCHASES", "Total DEVIS (non inflaté)", "Commentaires", "Options", "Devis(Devis)", "Index", "Niveau num"}),
#"Personnalisée ajoutée1" = Table.AddColumn(#"Colonnes permutées", "Niveau arbre", each if Estimations[Niveau num]{[Index]} > Estimations[Niveau num]{[Index]+1} then 1 else 0, type number)
in
#"Personnalisée ajoutée1"
Would you have an idea to solve this?
Thanks in advance for your help

Answer 1

change
#"Personnalisée ajoutée1" = Table.AddColumn(#"Colonnes permutées", "Niveau arbre", each if Estimations[Niveau num]{[Index]} > Estimations[Niveau num]{[Index]+1} then 1 else 0, type number)
to
#"Personnalisée ajoutée1" = Table.AddColumn(#"Colonnes permutées", "Niveau arbre", each if [Niveau num]{[Index]} > [Niveau num]{[Index]+1} then 1 else 0, type number)
you cannot refer to Estimations which is (a) the wrong name, since you used _Estimations, and (b) wrong since that step would not have the index added yet anyway
EDIT -- from your updated image, your column is not numerical so you can't use >. Change the column format to numerical before the last Table.AddColumn()
FINAL EDIT
let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", Int64.Type}}),
#"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
#"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each try if #"Added Index"{[Index]}[Column1] > #"Added Index"{[Index]+1}[Column1] then 1 else 0 otherwise 0)
in #"Added Custom"