I have designed a couple of simple footprints. On the silk layer, I have text which says “REF**” which is automatically replaced with the correct designator on the PCB, eg U1, U2, U3 etc.
I would like to do precisely the same thing on the Fab layer too, so I’ve also written “REF**” on the Fab layer. However, this doesn’t seem to be getting replaced by the true designator, so I have “REF**” written all over my Fab layer on the PCB.
What is the correct way to fix this? Thanks in advance.