For the application of the last paragraph of II of article L. 1262-4, the employer shall complete, for each seconded employee concerned, the secondment declaration provided for in I of article L. 1262-2-1, using the “SIPSI” tele-service, with the following information:
1° The duration of the extension of the application of the rules relating to the matters listed in I of article L. 1262-4 for a period of no more than six additional months;
2° The reason for the extension.