Selection of section 139(4) required when an original ITR is discarded to file a subsequent return. If an Original ITR filed under section 139(1) is discarded after the section 139(1) due date, the taxpayer must select section 139(4) when filing the subsequent return; original ITR date and acknowledgement fields are not applicable. To file a revised return later, the taxpayer must provide the original filing date and acknowledgement number of the valid ITR (the subsequent return filed under section 139(4)).