I'm working in similar case, trying to set a color Red at Date field in PO Requisition (Form), Oracle R12.13, based in a Condition in one field at Requisition Line block, using When New Item Instance event. But what I get as result is "all the rows" of Block (Grid) are in Red, rows where the Condition is false or True.

My setup on field is in Action Tab using Property = FOREGROUND_COLOR = Red color code

At that point I Can't see the SET_ITEM_INSTANCE_PROPERTY in the list of Property how the thread comments.

Can you share how to solve this ?? Appreciate that.