How to use the tag Key?

BlackBirdBlackBird Member Posts: 52
edited 2010-02-26 in NAV Three Tier
Hi all,

When publishing a Page based on t 37 (Sales Line) as a webservice there is a tag <Key>. See the linein red:

soapenv:Envelope xmlns:soapenv="; xmlns:ord="urn:microsoft-dynamics-schemas/page/order">
<!--1 or more repetitions:-->

how should one use this field? Is it used to select a key of table 37? What is the syntax?
I have tried several values but i keep getting the error: Key "" is not wel formed!
Best regards and thanx for your help
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