Before the proc append, the dates format are different between variables in the source and target datasets. I don't know if it is possible to remove a format before, but you can redefine them with the same format. To skip the warning messages into then Proc Append, I guess the best way is to remove the format inside the Proc Append. ... View more

proc append base = table_cible data = table_source force ; format date_abc date_xyz; /* Here, define an empty format for the date variables */ run; ... View more