What's needed for eRx code to generate successfully?

In Provider Identifiers:
First name
Family name
Provider number
Prescriber number
Practice address (Line 1, Suburb, Postcode, State)
Practice contact details (phone, fax)
HPII

In System Configuration:

Enable Tokenised Electronic Prescribing ticked (in Electronic Prescribing)

In Practice Configuration:
HPI-O No.
NASH P12 Certificate File (under eHealth and Health Identifier)
PIC - Personal Identification Code (under eHealth and Health Identifier)

In Patient Settings:
Title
First name
Family Name
Address (Line 1, Suburb, Postcode, State)
Sex
Medicare number and IRN
Birth date
IHI number

In Prescription:
Prescription Date
Item name
PBS code
Quantity
Route
Repeats
Instruction*
Script number (automatically generated by us)

*