Hi,

On Help for Error number 1 i read:

File "name" does not exist (Error 1)

then "name" is a usefull parameters,

but for various command i see on MESSAGE() only:

File does not exist.

and SYS(2018) is empty.

this is not a banal problem
because for this simple program:

....
APPEND FROM FILENAME1
APPEND FROM FILENAME2
....

the ERROR(),MESSAGE() not resolve the ambiguity,
and LINENO() is a very panic solution.

The only way is TRY/CATCH every single line,
or write the filename on a variable ( i build my error parameter )

Fabio