Help explain Extended Data Types

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Posted on by bankk

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Hi everyone. As I'm getting more familiar with AX in general, I'm trying to get my head around certain concepts that I don't quite fully understand. I get the concept but when I attempt to drill down in the AOT I get lost. So here's any example...

CustAccount <extends> CustVendAC <extends> ExternalAccount

When I bind the CustAccount EDT to a control, I get a dropdown with the customer name and account number. Great!!! But how does it work behind the scenes. I've read on the topic in books and online but nothing has a concrete walkthrough that explains and deconstructs EDTs.

As always, any help would be appreciated!

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Syed Zeeshan Haider... 725 on at

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Check the Relations of the EDT. When you click the + on the EDT you will find relations node.

In AX 2012 there is also a new property on the EDT "Reference Table" where the referenced or linked of the table with the EDT can be set.

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Community Member on at

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Hi,

We can not explicitly see how it works because that behaviour is written in system classes that we can not access. Debugger won't allow you to enter super() on the lookup method.

However, like Zeeshan said, it is based on the relation defined for the EDT.

Notice that we can not define relations for EDTs anymore with AX 2012. Only legacy EDTs (which have a LegacyId value) have relations. Now all relations must be defined at table level.

Regards,

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bankk 6,609 on at

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Thanks for the replies. I have seen the relations node but looking at it doesn't help a whole lot quite honestly. So if we take CustAccount as an example, CustAccount is related to CustTable.AccountNum. But where does it define that the customer name should be shown as part of this EDT? Along that same vein, can we add additional fields from the related table? Thanks in advance!

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Andrew Xu 3,877 on at

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KBANH,

The fieds of drop down list are defined in the field group AutoLookup of that table. You also can create a form to show the fields you need. Just refer to the form CustTableLookup, it will be triggered when you are selecting customer when creating sales order.

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bankk 6,609 on at

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Andrew, thanks for the clarification. This approach doesn't work with all EDTs which populates a drop down, correct? I was looking at CustGroupId trying to see if the AutoLookup field group defines the values, which it didn't. Can you share how you make the determination of the values for an EDT? Thanks again.

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Andrew Xu 3,877 on at

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For CustGroupId in table CustGroup, the properties "TitleField1" and "TitleField2" define the fields in drop down list becasue the AutoLookUp is empty and no lookup form exists.

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sureshch 20 on at

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Please follow the below details for EDT Relations.

When You create an EDT In ax and after adding the Table Reference with the related field into EDT.

When you are using this EDT field in any of the form or table . The lookup sequence will be as below.

First it look for the Look up form.

Second it look for the AutoLookup group in the field groups.

Third it will look for the Title fields.

But the related field is the default field in all these cases.

Thanks!

Suresh

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Basheer17 2,720 on at

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Please refer community.dynamics.com/.../224521. Look for Andre's comment.

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