Form Personaliztion of Multi-Record Blocks

Hello,

I am stuck up with an issue in personalizing a Purchase Order Summary form. The requirement is: You provide the Buyer name in the Purchase Order Summary form and click on "Find", the Purchase Order Headers screen comes up with list of Purchase orders created by that buyer, here I want to conceal the PO Number only of those purchase orders with Approval Status "Incomplete" or "In Process". here is the FP I created for doing this

Condition Tab

Trigger Event: WHEN-NEW-RECORD-INSTANCE

Trigger Object: HEADERS_FOLDER

Condition: :HEADERS_FOLDER.AUTHORIZATION_STATUS IN ('INCOMPLETE','IN PROCESS')

Actions Tab

Type: Property