Dear Experts,
Thanks a lot for your support, finally I've created the following:
loop at internal_table.
chain.
FIELD field_1 module get_field2 on request.
FIELD field_2.
endchain.
endloop.
With the module get_field2 of the "on request" I can read the value for field 2 and works correctly.
Thanks for your help
Regards,
Rebeca