Maxl import command using remote path

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Hi the following used to work in Maxl / Essbase v11:

connect as $login_database identified by $password_database 

using server rules_file 'CUS10L4' on error write to '\\\\10.35.0.15\\ESSBASE_BATCH\\LOGBATCH\\PNL_DIM_CUS10L4.err';

It seems that it is not the case anymore with 21, how to rewrite the path correctly ?

  ERROR - 1030100 - Cannot open file: [\10.35.0.15\ESSBASE_BATCH\LOGBATCH\PNL_DIM_CUS10L4.err].

  ERROR - 1241101 - Unexpected Essbase error 1030100.

Thank you

Version (include the version you are using, if applicable):

21.4.2

Code Snippet (add any code snippets that support your topic, if applicable):