Requesting for logic

The a!keys() function gives you the list of keys in your dictionary. Use a foreach to loop on that list and compare the two values from each dictionary. Pretty straight forward...

Give it a try and come back when you have something working.

a!localVariables(
  local!oldCargo: cast(
    typeof(
      'type!{urn:com:appian:types:peg:car}PEG_CAR_Cargo'()
    ),
    rule!PEG_CAR_QRY_getCargo(cargoIds: ri!cargoId)
  ),
  local!newCargo: cast(
    typeof(
      'type!{urn:com:appian:types:peg:car}PEG_CAR_Cargo'()
    ),
    index(ri!formattedData, "Cargo", null)
  ),
  local!updatedFields: a!keys(local!newCargo),
  a!forEach(
    local!updatedFields,
    a!localVariables(
      local!field: fv!item,
      local!oldValue: local!oldCargo[local!field],
      local!newValue: local!newCargo[local!field],
      if(
        local!oldValue <> local!newValue,
        a!map(
          "fieldName": local!field,
          "oldValue": local!oldValue,
          "newValue": local!newValue
        ),
        null
      )
    )
  )
)

Glad to help @Shukur Shake :)

Glad to help @Shukur Shake :)