Files single Word Processing Field.
YS(X)=TEXT line X
Output:
[DATA] if no errors VS [ERROR]
It REPLACES previous text if any with current text.
Input:
FILEN= fileman file Number
IEN= internal record number (cannot create a new record)
FIELD= field to be modified (must be a WP field)
YS(1)= TEXT line 1
...
