encodings not taken into accounr in multi modules projects

When trying to compile a Maven config based multi modules project with
IDEA, the specified encoding in Project Settings -> File Encoding are
not taken into account.

2 modules uses ISO-8859-1, one UTF-8.  this is set in Maven config & in
Project Settings -> File Encoding.
Maven compiles everything correctly.

IDEA always uses UTF-8 to compile ISO-8859-1 encoded modules, resulting
in errors.

What can I dot to get IDEA compiler to use encoding settings?


BTW: is there a way to plug the IDEA compile button to a maven goal?

regards