Extending Microsoft Dynamics 365 Finance and Supply Chain Management Cookbook - Second Edition

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EDTs can also extend other EDTs; although, child EDTs can only affect appearance properties. This is useful when we want to enforce the physical storage attributes of a range of types, but have a different label depending on the context. If we change the size of a base EDT, all the EDTs that extend it will be affected and, consequently, all of the fields that are based on them.

We often extend specific EDTs when creating an EDT for certain types of fields.

The typical EDTs we use for this are shown in the following table:

EDT	Base type	Size	Reason
SysGroup	String	10	This is used for the primary key fields for group tables. Group tables are those used for backing tables for drop-down lists. They may provide further definition ...