I defined the class DATE-YYMMDD and it works. So simple and so obvious!
I have been trying all sorts of combinations around DATE-AAMMDD thinking that would be the right way to go.
Thinking about that I remember back to the Y2K 'bug' that this is specific to that point in time.
Thanks for the reply.
for the Class 'DATE' the element is auto-filled with 00/00/0000 and FMT=DD/MM/YYYY,DAYFMT=YYYYMMDD,INP=00/00/0000
for the Class 'DATE-YYMMDD' would an equivalent be 00/00/00 and FMT=DD/MM/YY,DAYFMT=YYMMDD,INP=00/00/00