How to get the next release date with DDL FTP request?

I am attempting to get the next release date for CPI and RPI.

In my request I specify

{LOGON} (REMOVED)

{FORMAT}

{EXTRACTION} X1

{TRIGGER}

NOW

{FORMAT}

SRVRFILEPREFIX=TEST

DCDEFLT=Y

MERGE=Y

TRAN=N

MNEMONIC=Y

NAME=Y

{REQTYPE} S

{DATATYPES}

DS.NDOR1_DATE

DS.NDOR1_REF_PERIOD

{INSTRUMENTS}

UKCHAW..

UKCONPRCF

And I expect it to report back the next release date for UKCHAW.. and UKCONPRCF (RPI and CPI).

The validation output reports

Extraction Definition X1 NOW

Seq 1 Static Datatypes: 0 Stocks: 2

REJECTED - SYNTAX

** End of Extraction Summary **

{EXTRACTION} X1

{TRIGGER}

{FORMAT}

{REQTYPE} S 00001

{DATATYPES}

DS.NDOR1_DATE

********* INVALID DATATYPE

DS.NDOR1_REF_PERIOD

********* INVALID DATATYPE

********* NO VALID STATIC DATATYPES

{INSTRUMENTS}

** End of Errors **

** End of Validation Report **

Where am I going wrong?