HMRC unit identification number

When completing SA returns with PTP, I am getting warnings that the 'HMRC unit identification number is not entered on the year specific client details'. 

Is this number to be found anywhere on the client details in the agent online screens?  If so I can't seem to spot it.

If I enter '1', the warning messages go away.

Does it matter if 1 is the wrong number anyway? 

Comments
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I hope not 'cos that's what I

Jane S-D |

I ignore it

vince8 |

Thanks both

nutwood |

I think I have read somewhere a long time ago

gilbob |