Sum of Time differences by two condition

Thanks! 
The code works out perfectly.

However, after i swapped it to powerbi loaded database, it shows token identifier expected. How should i amend the code?

let
    Source = BATCH_RUN_STEP_LABOR_TRANSACTION, let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, TRANSACATION_DATE_TIME = _t, TRANSACTION_STATUS = _t, BATCH_RUN_STEP_LABOR_ID = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source, {
        {"ID", Int64.Type},
        {"TRANSACATION_DATE_TIME", type datetime},
        {"TRANSACTION_STATUS", Int64.Type},
        {"BATCH_RUN_STEP_LABOR_ID", Int64.Type}
    }, "es"),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Time Spent", each
        if [TRANSACTION_STATUS] = 7 then
            [TRANSACATION_DATE_TIME] -
            Table.Sort(
                Table.SelectRows(
                    #"Changed Type",
                    (k) => k[TRANSACTION_STATUS] = 4 and k[TRANSACATION_DATE_TIME] < [TRANSACATION_DATE_TIME]
                ),
                {{"TRANSACATION_DATE_TIME", Order.Descending}}
            ){0}[TRANSACATION_DATE_TIME]
        else null,
        type duration
    ),
    #"Grouped Rows" = ""
in
    #"Grouped Rows"

Hope you can assist me again on this manner