How to get attribute value from list?

A typical mistake is when users try getting a value of an attribute from a list.

For example, if you want to get the user who changed the document state:

10: GETOBJVALUE CHILD:StateChanges ATTRIB:UpdateUser

This is an incorrect expression.

The right expression would be to filter the child list and then get the first element of the list.

Example:

10 GETOBJVALUE EXP:20 ATTRIB:UpdateUser
20 FIRST EXP:30 
30 FILTER CHILD:StateChanges EXP:40
40 EQUAL ATTRIB:SystemInitiated CONST:False

Explanation:

• 10: get the value of the UserUpdate field from object in expression 20
• 20: get the first record in the list in expression 30
• 30: filter the child list StateChanges by the filter in expression 40
• 40: check if the attribute SystemInitiated is equal to 'False'