Using remote copy without NOSPLIT enabled results in a “Failed: Source file format is not specified or is unsuitable for (re-)partitioning” error message.
Changing the copy to enable the NOSPLIT option worked.
If we really cannot copy and automatically partition files like this one, it would be nice to include some examples of the types of files that can not be re-partitioned and that the NOSPLIT option must be specified.
The layout for data file is:
layout_int := RECORD