How to find Cancelled Requisitions?

By using below query You can get all the Canceled Requisitions in the PO Module.

SELECT
prha.requisition_header_id "requisition_header_id"
,prha.segment1 "Requisition Number"
,prha.preparer_id "preparer_id"
,TRUNC(prha.creation_date) "creation_date"
,prha.description "description"
,prha.note_to_authorizer "note_to_authorizer"
FROM
po_requisition_headers_all prha
,po_action_history pah
WHERE action_code='CANCEL'
AND pah.object_type_code='

REQUISITION'
AND pah.object_id=prha.requisition_header_id