I've been able to add a subscreen with new fields on the Purchase Order Line Item area and I am able to create, maintain and display data in those fields with no problem using much of the example code.
I've however came up against a problem where I want the to hide the fields in certain conditions. This I can do, since I'm just using the fieldstatus as '-' in FIELDSELECTION_ITEM, but method PROCESS_ITEM is still validating the field value and throwing errors/warning for those fields (even though the fields are not displayed). I've tried debugging this area, but I can't see any means to switch off my validations in PROCESS_ITEM depending on the fieldstatus.
Does anyone have any ideas I can play with?