Deleting Default Values with Procedures 
Use
You cannot manually delete default values that were set by a procedure.
However, you can use another procedure to delete a default value.Use the following language element to delete default values:
$DEL_DEFAULT ($SELF, <characteristic>, <string>)

Deleting a default value for a numeric characteristic:
Characteristic HEIGHT has a default value that was set by a procedure (refer to
Setting Default Values with Procedures).$DEL_DEFAULT ($SELF, HEIGHT, 1.5 * $SELF.WIDTH)
Prerequisites
The default value you want to delete was set by a procedure.
If the value set by the procedure is not a default value, $DEL_DEFAULT is ignored.
Features
When the default value is deleted, this does not automatically delete other values that were inferred from the default value.