GST Refund XLSB Fill

Important: This script never edits the original file directly. It copies original/GST_REFUND_S01A.xlsb into output/ and fills only that copied file.

Data entry starts from row 11.

Applied Mapping

Inward from gstr2b.xlsx:
- B2B Invoices List + Cr. & Dr. Notes List
Outward from gstr1a.xlsx:
- B2B Invoices + CDN
GSTIN => C4
From Return Period => C5
To Return Period => C6
0 / 0.00 / empty / null => blank cell

Current Prepared Data

Array
(
    [gstin] => 
    [from_return_period] => 
    [to_return_period] => 
    [rows] => Array
        (
        )

)