LPL Error message = Must Reference a Mutable Field

Jeff Johnson

Hi,

Does anyone know what this error message means for the following line in LPL?

ShippingNotes = GCSHShipToLocation

Error message = Must Reference a mutable field.

ShippingNotes is a text field in the PO business class. GCSHShipToLocation is a custom derived text field in the PO business class.

Why doesn't this work? Trying to set an existing text field to a value from another text field.

PurchaseOrder is a BusinessClass

    owned by po

    Derived Fields

        GCSHShipToLocation is a DerivedField

            type is Text

            if (ShipToLocation = "SC STOREROOM")

                return "NOTE:  Trucks 32ft or less are recommended for delivery at this location due to the size of dock/receiving area.  Dock area cannot accommodate semi trucks."

Code Snippet in question:

paragraph

                ShipToLocation

                    label is "ShipTo"

                    when value changed

                        refresh GCSHShipToLocation

                        ShippingNotes = GCSHShipToLocation

Dr. Awesome

I wonder if GCSHShipToLocation needs to be added to the form. You can use visible when (false) to hide it from users. It might be the run-time needs it "registered" on the form itself to use it like this though.

0904080939293831.xls