Code Requisition in the Approach is a repeatable side quest in Dragon Age: Inquisition.
Finding examples of Venatori notes and ciphers will let Leliana decode them more efficiently.
Speak to a requisition officer at one of the Inquisition camps in Western Approach.
Collect the following items:
Venatori CipherVenatori Cipher
Message FragmentMessage Fragment
Return to any requisition table and craft the item "Venatori Intelligence".
Items are dropped by Venatori troops in the Western Approach (e.g.: during Griffon Wing Keep). Venatori can re-spawn south of Echo Back Canyon Camp in the north area of the map.