[Fix] better unique name for Opening Period
[Fix] better unique name for Opening Period

Antiun/c2c-rd-addons,camptocamp/c2c-rd-addons,Antiun/c2c-rd-addons,camptocamp/c2c-rd-addons,Endika/c2c-rd-addons,VitalPet/c2c-rd-addons,VitalPet/c2c-rd-addons,camptocamp/c2c-rd-addons,VitalPet/c2c-rd-addons,Endika/c2c-rd-addons,Antiun/c2c-rd-addons,Endika/c2c-rd-addons