Incremental Load + Update QVD using filebase name

[#1]

Hi the community,

New to Qlikview, I would like to create an incremental load and update the qvd file created with new data based on the excel file name.

All my excel files starts with YYYYMMDD.

As you can see below, I started to write the script.

Incremental_Load_test:
LOAD Left(FileBaseName(),8) as [Period ID],
Title,
[Trip Number],
Status
FROM

(ooxml, embedded labels, header is 1 lines)
where [Period ID] > '20150315';

Concatenate
LOAD

Title,
[Trip Number],
Status
FROM
(qvd);
Store Incremental_Load_test into (qvd);

When I upload, it says that the field [Period ID] is not found.

Any suggestion ?

Thank you