Answer

Users may want to know how to add the auto-numbering function in the Asset

First, you can check the Organization level for all the autokey values. 

Go to the Organizations module and select your Org, then Select Action -> Autonumber Setup -> Organization Level.  You will see a dialog like this:

Autonumber Dialog

You can set the seed values here and prefix values if you want.  As you can see, the assetnum autokey is already there and ready to use.

So to enable the autokey for an asset, all we need to do is change some configuration settings.  Go to Database Configuration module and find the Asset object.  Click on the attribute tab and find the ASSETNUM field.  Expand it.  If you look for the field “Autonumber”, you will see that it is already populated with the right autokey.  Now we just need it so that this field uses that autokey by setting the default value.  So enter &AUTOKEY& for the “Default Value” field like so:

Assetnum Autokey

Save your changes.  Now you just need to enable Admin Mode and apply your configuration changes.  Now you should be able to enter a new asset with an auto number!

Same steps - Go to the Organizations module and select your Org, then Select Action -> Autonumber Setup -> Site Level.  You will see a dialog like this: