Circular Dependency Issue Referencing Line Above

To resolve circular dependencies in DAX you either need to completely rethink your approach, or push the calculation further upstream (into Power Query for example)  which will make the result static.

let
  Source = Table.FromRows(
    Json.Document(
      Binary.Decompress(
        Binary.FromText("i45WMlTSUTIGYlOlWJ1oJSMgywLOM0aRMwGyjCC8WAA=", BinaryEncoding.Base64), 
        Compression.Deflate
      )
    ), 
    let
      _t = ((type nullable text) meta [Serialized.Text = true])
    in
      type table [Week = _t, Incoming = _t, Capacity = _t]
  ), 
  #"Changed Type" = Table.TransformColumnTypes(
    Source, 
    {{"Week", Int64.Type}, {"Incoming", Int64.Type}, {"Capacity", Int64.Type}}
  ), 
  #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type), 
  #"Added Custom" = Table.AddColumn(
    #"Added Index", 
    "Remainder", 
    each List.Accumulate(
      {0 .. [Index]}, 
      0, 
      (state, current) =>
        List.Max({state + #"Added Index"[Incoming]{current} - #"Added Index"[Capacity]{current}, 0})
    ), 
    Int64.Type
  )
in
  #"Added Custom"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done". Once you examined the code, replace the Source step with your own source.