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    <p>I think I understand this problem now. </p> <p>In short: You are assuming that a lookup field will give you access to the fields of the lookup'ed record. This is incorrect.</p> <p>To expand on that, lets start with what Crm actually gives you in a lookup field.</p> <p>If you have a look at the MSDN <a href="http://msdn.microsoft.com/en-us/library/6881e99b-45e4-4552-8355-2eef296f2cd8#BKMK_getValue" rel="nofollow">here</a>. We can see that when getValue() is performed on a lookup attribute we are returned an array with three string properties.</p> <blockquote> <p>entityType String: the name of the entity displayed in the lookup</p> <p>id String: The string representation of the GUID value for the record displayed in the lookup.</p> <p>name String: The text representing the record to be displayed in in the lookup.</p> </blockquote> <p>Things to note:</p> <p>There is no <code>keyValues</code> property (I'm not sure where you have got this from - please let me know if I'm missing something here). </p> <p>Apart from the name field the we don't have any other record data. E.g: If this was a lookup to a contact we could tell its fullname (from the name property) but not its address or phone number.</p> <p>So, to summarise the reason it fails when Crm sets the lookup is because it only provides the information from above, it will not populate <code>keyValues</code> or any of the fields from the lookup'ed record, e.g. <code>po_months</code>.</p> <p>I'm guessing the reason it works when you set the lookup, is because you are creating the <code>keyValues</code> property somewhere else in code.</p> <p>If you want information from a record related via a lookup, you have to perform a webservice call to get that information - using the id from the lookup.</p>
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    1. USJames Wood
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    1. COThanks, I understand what is happening now. I queried to grab the record from the id (rather than trying to access the fields of the record in the lookup directly like that and this solved my issue.
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