Hello Erin,

You can set up a business event for that case.

First, create a Generic Inquiry which will list all expense claims with Approved status. In this GI, expose in Results Grid fields that you need to use in the notification. An example GI for 2020 R1 is attached. Make sure you set Make visible on the UI check box after importing - otherwise, it will be unavailable for selection on Business Events form.

Second, on the Business Events (SM3020PL) form, create a new record and set it up as follows:

• Type: Trigger By Record Change
• Raise Event: For Each Record
• Screen Name: GI you created in the first step.
• Trigger Conditions tab: Record Inserted
• Subscribers tab: Create Subscriber > Email Notification

Set up notification as follows:

For example on how to set up the link for the docuemnt in notification template, refer to the following article: 

Make sure From and To emails are set up.

For From, I used EPExpenseClaim->Claimed By->Default Contact->Email.

Result: once the expense claim becomes Approved, it will appear on the generic inquiry and the system will send a notification.