{{Quickfixn}} Quote <S> Tag appears more than once

[Russell Watson]

 Hello,

After many days of research and re-reading (
http://quickfixn.org/tutorial/custom-fields-groups-and-messages.html) many
times and trial and error regrettably I have been unable to solve the error
of Tag appears more than once in Quote <S> message

The messages I am receiving

<incoming> 8=FIX.4.2 9=355 35=S 49=xxx 115=xxxx 56=xxxxxx 34=2
52=20190807-10:10:45 43=N 131=OR00999999x001 117=OU1JZXLH8B0000B4 55=TR30
48=GB00B24FF097 22=4 167=CS 207=L 6158=xxxx 537=1 132=136.68 134=250000
188=0.00 159=29.99 133=138.18 135=250000 159=29.66 190=0.00 157=62
60=20190807-10:10:45.457 62=20190807-10:11:15 63=6 64=20190808 15=GBP
120=GBP 9007=1 10=116

<event> Message 2 Rejected: Tag appears more than once (Field=159)

I have adapted the DataDictionary countless times with no success e.g.

<messages>
  ...

<message name='Quote' msgtype='S' msgcat='app'>
<!-- ... other fields ... -->
<group name="NoAccruedInterestAmt" required="N">
      <field name="AccruedInterestAmt" required="N"/>
</group>
<!-- ... other fields ... -->
</message>

  ...
</messages>
...
<fields>
  ...
<field number='9876' name='NoAccruedInterestAmt' type='NUMINGROUP'/>
<field number='159' name='AccruedInterestAmt' type='AMT' />
</fields>
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