administr commiss european commun social secur migrant worker decis octob certif applic legisl form period post exce month administr commiss european commun social secur migrant worker regard articl council regul eec made respons deal administr matter relat applic regul decis amend light provis council regul eec decemb enter forc juli condit modern econom life make employe industri commerci agricultur undertak make frequent trip abroad benefit undertak emploi difficult case obtain time prior departur certif applic legisl design institut countri undertak regist offic ground make procedur issu certif applic legisl flexibl order ensur insur person carri document show stai member state busi remain cover legisl countri undertak emploi situat decid period post exceed month institut refer articl regul eec issu undertak request copi form bear serial number complet box indic date undertak complet copi form copi hand worker prior departur copi hour design institut countri undertak regist offic decis replac decis enter forc dai month public offici journal european commun chairmanof administr commissiong schroeder decis octob applic articl regul eec administr commiss european commun social secur migrant workershav regard articl council regul eec made respons deal administr matter aris regul eec council regul eec decis amend account provis regul eec eec enter forc juli articl regul eec provid certif applic legisl issu worker employ request case refer articl articl regul eec articl regul eec prescrib time limit issu certif decid institut refer articl regul eec issu certif applic legisl form issu certif request commenc occup pursu state compet state worker refer articl regul eec decis replac decis februari enter forc dai month public offici journal european commun chairmanof administr commissiong schroeder