The last post from SNS3Guppy is interesting. I hadn't noticed that in JAR-FCL 1 before. So it appears that you "shall" log IFR time but you "may log" instrument time.
My Jeppesen JAR FCL log book which is nearly a direct copy of the JAR-FCL 1 IEM 1.080. (page 2-A-30 & 2-A-31) doesn't contain an Instrument column but does contain an IFR column.