PO Import: System overwrite the receipt_require_flag in po_line_locations_all

Hi All,

I am using the Import Standard Purchase Orders Program for creating new PO's.When i create new PO with RECEIPT_REQUIRED_FLAG value as NULL, the receipt_require_flag is overwriten with 'Y' or 'N'in PO_LINE_LOCATIONS_ALL.

Could you please  explain On what basis RECEIPT_REQUIRED_FLAG is inserting 'Y' or 'N' instead of NULL  in PO_LINE_LOCATIONS_ALL.

Any inputs is highly appreciated.

Thanks,

Sudhakar.